174226-174300 Books for Rent


Boundary Issues in Counseling : Multiple Roles and Responsibilities, Herlihy, Barbara and Corey, Gerald, 1556202458   Boundary Issues in Counseling : Multiple Roles and Responsibilities
ISBN-10:
 1556202458

ISBN-13:
 9781556202452

Author:
 Herlihy, Barbara and Corey, Gerald

Edition:
 2

Publisher:
 American Counseling Association

Tattoo Traditions of Hawaii, Allen, Tricia, 1566477700   Tattoo Traditions of Hawaii
ISBN-10:
 1566477700

ISBN-13:
 9781566477703

Author:
 Allen, Tricia

Edition:
 

Publisher:
 Mutual Publishing LLC

Multiparty Democracy and Political Change : Constraints to Democratization in Africa, Mbaku, John Mukum and Ihonvbere, Julius Omozuanvbo, 159221424X   Multiparty Democracy and Political Change : Constraints to Democratization in Africa
ISBN-10:
 159221424X

ISBN-13:
 9781592214242

Author:
 Mbaku, John Mukum and Ihonvbere, Julius Omozuanvbo

Edition:
 

Publisher:
 Africa World Press

Charles Dickens : A Literary Reference to His Life and Work, Davis, Paul B., 0816064075   Charles Dickens : A Literary Reference to His Life and Work
ISBN-10:
 0816064075

ISBN-13:
 9780816064076

Author:
 Davis, Paul B.

Edition:
 

Publisher:
 Facts On File, Incorporated

The Serpent's Gift : Gnostic Reflections on the Study of Religion, Kripal, Jeffrey John, 0226453812   The Serpent's Gift : Gnostic Reflections on the Study of Religion
ISBN-10:
 0226453812

ISBN-13:
 9780226453811

Author:
 Kripal, Jeffrey John

Edition:
 

Publisher:
 University of Chicago Press

Schizoaffective Disorder : New Research, Murray, William H., 1600210309   Schizoaffective Disorder : New Research
ISBN-10:
 1600210309

ISBN-13:
 9781600210303

Author:
 Murray, William H.

Edition:
 

Publisher:
 Nova Science Publishers, Incorporated

Prions : New Research, Doupher, Bridgette V., 1600210198   Prions : New Research
ISBN-10:
 1600210198

ISBN-13:
 9781600210198

Author:
 Doupher, Bridgette V.

Edition:
 

Publisher:
 Nova Science Publishers, Incorporated

Medicine and Care of the Dying : A Modern History, Lewis, Milton J., 0195175484   Medicine and Care of the Dying : A Modern History
ISBN-10:
 0195175484

ISBN-13:
 9780195175486

Author:
 Lewis, Milton J.

Edition:
 

Publisher:
 Oxford University Press, Incorporated

The Lowell Experiment : Public History in a Postindustrial City, Stanton, Cathy, 1558495460   The Lowell Experiment : Public History in a Postindustrial City
ISBN-10:
 1558495460

ISBN-13:
 9781558495463

Author:
 Stanton, Cathy

Edition:
 

Publisher:
 University of Massachusetts Press

The World Economy and Great Post-Communist Change, Koodko, Grzegorz W., 1600210457   The World Economy and Great Post-Communist Change
ISBN-10:
 1600210457

ISBN-13:
 9781600210457

Author:
 Koodko, Grzegorz W.

Edition:
 

Publisher:
 Nova Science Publishers, Incorporated

The International Court of Justice : Its Role in the Maintenance of International Peace and Security, Lissitzyn, Oliver James, 1584777028   The International Court of Justice : Its Role in the Maintenance of International Peace and Security
ISBN-10:
 1584777028

ISBN-13:
 9781584777021

Author:
 Lissitzyn, Oliver James

Edition:
 

Publisher:
 Lawbook Exchange, Limited, The

Frontiers of History : Historical Inquiry in the Twentieth Century, Kelley, Donald R., 0300120621   Frontiers of History : Historical Inquiry in the Twentieth Century
ISBN-10:
 0300120621

ISBN-13:
 9780300120622

Author:
 Kelley, Donald R.

Edition:
 

Publisher:
 Yale University Press

Criminal Law, Reid, Sue Titus, 1933220325   Criminal Law
ISBN-10:
 1933220325

ISBN-13:
 9781933220321

Author:
 Reid, Sue Titus

Edition:
 7

Publisher:
 Roxbury Publishing Company

Economics, Ethics and the Market, Graafland, Johan J., 0415407702   Economics, Ethics and the Market
ISBN-10:
 0415407702

ISBN-13:
 9780415407700

Author:
 Graafland, Johan J.

Edition:
 

Publisher:
 Routledge

HFMA's Introduction to Hospital Accounting, Nowicki, Michael and Berger, Steven H., 1567932541   HFMA's Introduction to Hospital Accounting
ISBN-10:
 1567932541

ISBN-13:
 9781567932546

Author:
 Nowicki, Michael and Berger, Steven H.

Edition:
 5

Publisher:
 Health Administration Press

The Essential Dictionary of Science, Clark, John Owen Edward, 0760746168   The Essential Dictionary of Science
ISBN-10:
 0760746168

ISBN-13:
 9780760746165

Author:
 Clark, John Owen Edward

Edition:
 

Publisher:
 Barnes & Noble, Incorporated

Lehrbuch der Mathematischen Physik : Band 2: Klassische Feldtheorie, Thirring, Walter, 3211821694   Lehrbuch der Mathematischen Physik : Band 2: Klassische Feldtheorie
ISBN-10:
 3211821694

ISBN-13:
 9783211821695

Author:
 Thirring, Walter

Edition:
 2

Publisher:
 Springer

Elektrische Energietechnik : Band 3: Netze, , 3540673431   Elektrische Energietechnik : Band 3: Netze
ISBN-10:
 3540673431

ISBN-13:
 9783540673439

Author:
 

Edition:
 30

Publisher:
 Springer

Fuzzy Chaotic Systems : Modeling, Control, and Applications, Li, Zhong, 3540332200   Fuzzy Chaotic Systems : Modeling, Control, and Applications
ISBN-10:
 3540332200

ISBN-13:
 9783540332206

Author:
 Li, Zhong

Edition:
 

Publisher:
 Springer

Palliativmedizin, Husebö, Stein and Klaschik, E., 3540298886   Palliativmedizin
ISBN-10:
 3540298886

ISBN-13:
 9783540298885

Author:
 Husebö, Stein and Klaschik, E.

Edition:
 4

Publisher:
 Springer

Integrated System-Level Modeling of Network-on-Chip Enabled Multi-Processor Platforms, Kogel, Tim and Leupers, Rainer, 1402048254   Integrated System-Level Modeling of Network-on-Chip Enabled Multi-Processor Platforms
ISBN-10:
 1402048254

ISBN-13:
 9781402048258

Author:
 Kogel, Tim and Leupers, Rainer

Edition:
 

Publisher:
 Springer

Radio Design in Nanometer Technologies, , 1402048238   Radio Design in Nanometer Technologies
ISBN-10:
 1402048238

ISBN-13:
 9781402048234

Author:
 

Edition:
 

Publisher:
 Springer

Multivariable Computer-Controlled Systems : A Transfer Function Approach, Rosenwasser, Efim N. and Lampe, Bernhard P., 1846284317   Multivariable Computer-Controlled Systems : A Transfer Function Approach
ISBN-10:
 1846284317

ISBN-13:
 9781846284311

Author:
 Rosenwasser, Efim N. and Lampe, Bernhard P.

Edition:
 

Publisher:
 Springer

Top Knife : Kunst und Handwerk der Traumachirurgie, Hirshberg, Asher and Mattox, Kenneth L., 3211329188   Top Knife : Kunst und Handwerk der Traumachirurgie
ISBN-10:
 3211329188

ISBN-13:
 9783211329184

Author:
 Hirshberg, Asher and Mattox, Kenneth L.

Edition:
 

Publisher:
 Springer

Regulation of Carcinogenesis, Angiogenesis and Metastasis by the Proprotein Convertases : A New Potential Strategy in Cancer Therapy, , 1402047932   Regulation of Carcinogenesis, Angiogenesis and Metastasis by the Proprotein Convertases : A New Potential Strategy in Cancer Therapy
ISBN-10:
 1402047932

ISBN-13:
 9781402047930

Author:
 

Edition:
 

Publisher:
 Springer

Knowledge Discovery from XML Documents : First International Workshop, KDXD 2006, Singapore, April 9, 2006, Proceedings, , 3540331808   Knowledge Discovery from XML Documents : First International Workshop, KDXD 2006, Singapore, April 9, 2006, Proceedings
ISBN-10:
 3540331808

ISBN-13:
 9783540331803

Author:
 

Edition:
 

Publisher:
 Springer

Neural Nets : 16th Italian Workshop on Neural Nets, WIRN 2005, International Workshop on Natural and Artificial Immune Systems, NAIS 2005, Vietri sul Mare, Italy, June 8-11, 2005, Revised Selected Papers, , 3540331832   Neural Nets : 16th Italian Workshop on Neural Nets, WIRN 2005, International Workshop on Natural and Artificial Immune Systems, NAIS 2005, Vietri sul Mare, Italy, June 8-11, 2005, Revised Selected Papers
ISBN-10:
 3540331832

ISBN-13:
 9783540331834

Author:
 

Edition:
 

Publisher:
 Springer

Dynamic Inventory Management in Reverse Logistics, Kleber, Rainer, 3540332294   Dynamic Inventory Management in Reverse Logistics
ISBN-10:
 3540332294

ISBN-13:
 9783540332299

Author:
 Kleber, Rainer

Edition:
 

Publisher:
 Springer

Management Models for Corporate Social Responsibility, , 3540332464   Management Models for Corporate Social Responsibility
ISBN-10:
 3540332464

ISBN-13:
 9783540332466

Author:
 

Edition:
 

Publisher:
 Springer

Effective Computational Geometry for Curves and Surfaces, , 3540332588   Effective Computational Geometry for Curves and Surfaces
ISBN-10:
 3540332588

ISBN-13:
 9783540332589

Author:
 

Edition:
 

Publisher:
 Springer

Trade Show Management, , 3409143335   Trade Show Management
ISBN-10:
 3409143335

ISBN-13:
 9783409143332

Author:
 

Edition:
 

Publisher:
 Vieweg Verlag, Friedr, & Sohn Verlagsgesellschaft mbH

Der geologische Aufbau Osterreichs, , 3211815562   Der geologische Aufbau Osterreichs
ISBN-10:
 3211815562

ISBN-13:
 9783211815564

Author:
 

Edition:
 

Publisher:
 Springer

Optik, Lipson, Stephen G. and Lipson, Henry S., 3540619127   Optik
ISBN-10:
 3540619127

ISBN-13:
 9783540619123

Author:
 Lipson, Stephen G. and Lipson, Henry S.

Edition:
 

Publisher:
 Springer

Mécanique Quantique. une Introduction, Greiner, Walter, 3540643478   Mécanique Quantique. une Introduction
ISBN-10:
 3540643478

ISBN-13:
 9783540643470

Author:
 Greiner, Walter

Edition:
 

Publisher:
 Springer

Regelung Elektrischer Antriebe, Leonhard, Werner, 354067179X   Regelung Elektrischer Antriebe
ISBN-10:
 354067179X

ISBN-13:
 9783540671794

Author:
 Leonhard, Werner

Edition:
 2

Publisher:
 Springer

Die Maßnahmen der XIV EU-Mitgliedsstaaten gegen Österreich : Möglichkeiten und Grenzen einer 'streitbaren Demokratie' auf europäischer Ebene, Schorkopf, Frank, 3540430075   Die Maßnahmen der XIV EU-Mitgliedsstaaten gegen Österreich : Möglichkeiten und Grenzen einer 'streitbaren Demokratie' auf europäischer Ebene
ISBN-10:
 3540430075

ISBN-13:
 9783540430070

Author:
 Schorkopf, Frank

Edition:
 

Publisher:
 Springer

21st Century Sociology : A Reference Handbook, , 1412916089   21st Century Sociology : A Reference Handbook
ISBN-10:
 1412916089

ISBN-13:
 9781412916080

Author:
 

Edition:
 

Publisher:
 SAGE Publications, Incorporated

Lesson Study Communities : Increasing Achievement with Diverse Students, Wiburg, Karin M. and Brown, Susan, 1412916445   Lesson Study Communities : Increasing Achievement with Diverse Students
ISBN-10:
 1412916445

ISBN-13:
 9781412916448

Author:
 Wiburg, Karin M. and Brown, Susan

Edition:
 

Publisher:
 Corwin Press

Handbook of Global Supply Chain Management, Myers, Matthew B., 1412918057   Handbook of Global Supply Chain Management
ISBN-10:
 1412918057

ISBN-13:
 9781412918053

Author:
 Myers, Matthew B.

Edition:
 

Publisher:
 SAGE Publications, Incorporated

On the Same Side, Ingouville, Francisco, 1412912385   On the Same Side
ISBN-10:
 1412912385

ISBN-13:
 9781412912389

Author:
 Ingouville, Francisco

Edition:
 

Publisher:
 Chapman Publishing, Paul

Shouting Won't Grow Dendrites : 20 Techniques for Managing a Brain-Compatible Classroom, Tate, Marcia L., 141292779X   Shouting Won't Grow Dendrites : 20 Techniques for Managing a Brain-Compatible Classroom
ISBN-10:
 141292779X

ISBN-13:
 9781412927796

Author:
 Tate, Marcia L.

Edition:
 

Publisher:
 Corwin Press

Write for Mathematics, Rothstein, Evelyn and Lauber, Gerald, 1412939941   Write for Mathematics
ISBN-10:
 1412939941

ISBN-13:
 9781412939942

Author:
 Rothstein, Evelyn and Lauber, Gerald

Edition:
 2

Publisher:
 Corwin Press

Making Math Connections : Using Real-World Applications with Middle School Students, Martin, Hope, 1412937655   Making Math Connections : Using Real-World Applications with Middle School Students
ISBN-10:
 1412937655

ISBN-13:
 9781412937658

Author:
 Martin, Hope

Edition:
 2

Publisher:
 Corwin Press

Aligning Standards and Curriculum for Classroom Success, Perna, Daniel M. and Davis, James R., 1412940907   Aligning Standards and Curriculum for Classroom Success
ISBN-10:
 1412940907

ISBN-13:
 9781412940900

Author:
 Perna, Daniel M. and Davis, James R.

Edition:
 2

Publisher:
 Corwin Press

Thinking Strategies for Student Achievement : Improving Learning Across the Curriculum, K-12, Graham, Joyce M. and Nessel, Denise D., 1412938813   Thinking Strategies for Student Achievement : Improving Learning Across the Curriculum, K-12
ISBN-10:
 1412938813

ISBN-13:
 9781412938815

Author:
 Graham, Joyce M. and Nessel, Denise D.

Edition:
 2

Publisher:
 Corwin Press

Using SPSS for Social Statistics and Research Methods, Wagner, William E. and Wagner, William E., III, 141294077X   Using SPSS for Social Statistics and Research Methods
ISBN-10:
 141294077X

ISBN-13:
 9781412940771

Author:
 Wagner, William E. and Wagner, William E., III

Edition:
 

Publisher:
 SAGE Publications, Incorporated

The End of Enlightenment?, , 1412940230   The End of Enlightenment?
ISBN-10:
 1412940230

ISBN-13:
 9781412940238

Author:
 

Edition:
 

Publisher:
 SAGE Publications, Incorporated

Die EU nach Nizza : Ergebnisse und Perspektiven, , 321183785X   Die EU nach Nizza : Ergebnisse und Perspektiven
ISBN-10:
 321183785X

ISBN-13:
 9783211837856

Author:
 

Edition:
 

Publisher:
 Springer

Der Europarat und die Verfassungsautonomie seiner Mitgliedstaaten : Eine europarechtliche Studie mit Dokumenten und Kommentaren, veranschaulicht durch die Aktionen des Europarates gegen die Verfassungsreform von Liechtenstein, Winkler, Günther, 3211224041   Der Europarat und die Verfassungsautonomie seiner Mitgliedstaaten : Eine europarechtliche Studie mit Dokumenten und Kommentaren, veranschaulicht durch die Aktionen des Europarates gegen die Verfassungsreform von Liechtenstein
ISBN-10:
 3211224041

ISBN-13:
 9783211224045

Author:
 Winkler, Günther

Edition:
 

Publisher:
 Springer

Produktion I : Produktions- und Kostentheorie, Fandel, Günter, 3540250239   Produktion I : Produktions- und Kostentheorie
ISBN-10:
 3540250239

ISBN-13:
 9783540250234

Author:
 Fandel, Günter

Edition:
 6

Publisher:
 Springer

Green Function Theory of Chemisorption, Davison, Sydney G. and Sulston, Kenneth. W, 1402044046   Green Function Theory of Chemisorption
ISBN-10:
 1402044046

ISBN-13:
 9781402044045

Author:
 Davison, Sydney G. and Sulston, Kenneth. W

Edition:
 

Publisher:
 Springer

Fluid Transport in Nanoporous Materials : Proceedings of the NATO Advanced Study Institute, Held in la Colle Sur Loup, France, 16-28 June 2003, , 1402043783   Fluid Transport in Nanoporous Materials : Proceedings of the NATO Advanced Study Institute, Held in la Colle Sur Loup, France, 16-28 June 2003
ISBN-10:
 1402043783

ISBN-13:
 9781402043789

Author:
 

Edition:
 

Publisher:
 Springer

Ecocardiografia Clinica, Henein, Michael Y. and Sheppard, Mary, 8847004594   Ecocardiografia Clinica
ISBN-10:
 8847004594

ISBN-13:
 9788847004597

Author:
 Henein, Michael Y. and Sheppard, Mary

Edition:
 

Publisher:
 Springer

Advances in Verification of Time Petri Nets and Timed Automata : A Temporal Logic Approach, Penczek, Wojciech and Pólrola, Agata, 3540328696   Advances in Verification of Time Petri Nets and Timed Automata : A Temporal Logic Approach
ISBN-10:
 3540328696

ISBN-13:
 9783540328698

Author:
 Penczek, Wojciech and Pólrola, Agata

Edition:
 

Publisher:
 Springer

Applications of Evolutionary Computing - Evoworkshops 2006 : Evobio, Evocomnet, Evohot, Evoiasp, Evointeraction, Evomusart and Evostoc, Budapest, Hungary, April  2006, Proceedings, , 3540332375   Applications of Evolutionary Computing - Evoworkshops 2006 : Evobio, Evocomnet, Evohot, Evoiasp, Evointeraction, Evomusart and Evostoc, Budapest, Hungary, April 2006, Proceedings
ISBN-10:
 3540332375

ISBN-13:
 9783540332374

Author:
 

Edition:
 

Publisher:
 Springer

Live Longer, Work Longer, Organisation for Economic Co-operation and Development Staff, 9264035877   Live Longer, Work Longer
ISBN-10:
 9264035877

ISBN-13:
 9789264035874

Author:
 Organisation for Economic Co-operation and Development Staff

Edition:
 

Publisher:
 Organization for Economic Cooperation & Development

The Ultimate Study Guide for Biology : (Topics: Evolution, Ecology, Kingdom Bacteria, Kingdom Protista, Kingdom Fungi and Viruses, Plant Form and Function) Volume 2: Key Review Questions and Answers with Explanations, Leonardi, Patrick, 1933023015   The Ultimate Study Guide for Biology : (Topics: Evolution, Ecology, Kingdom Bacteria, Kingdom Protista, Kingdom Fungi and Viruses, Plant Form and Function) Volume 2: Key Review Questions and Answers with Explanations
ISBN-10:
 1933023015

ISBN-13:
 9781933023014

Author:
 Leonardi, Patrick

Edition:
 

Publisher:
 Silver Educational Publishing

Poems I Wrote While Watching TV, Jeppesen, Travis, 1599713403   Poems I Wrote While Watching TV
ISBN-10:
 1599713403

ISBN-13:
 9781599713403

Author:
 Jeppesen, Travis

Edition:
 

Publisher:
 Aardvark Global Publishing

Kingdom and Culture in Genesis : When LIFE Meets Life, Niemeyer, Larry L., 097782361X   Kingdom and Culture in Genesis : When LIFE Meets Life
ISBN-10:
 097782361X

ISBN-13:
 9780977823611

Author:
 Niemeyer, Larry L.

Edition:
 

Publisher:
 Harvest Heralds, Incorporated

U-Betcha : The Practical Guide to Music Theory, Dane, Joey, 0977841707   U-Betcha : The Practical Guide to Music Theory
ISBN-10:
 0977841707

ISBN-13:
 9780977841707

Author:
 Dane, Joey

Edition:
 

Publisher:
 Kiss on Ellipse Publishing

Eagle : Medical Terminology in a Flash and Tabers Cyclopedic Medical Dictionary, Eagle, Sharon, 0803616570   Eagle : Medical Terminology in a Flash and Tabers Cyclopedic Medical Dictionary
ISBN-10:
 0803616570

ISBN-13:
 9780803616578

Author:
 Eagle, Sharon

Edition:
 20

Publisher:
 Davis Company, F. A.

Chaucer's Language, Horobin, Simon, 1403993564   Chaucer's Language
ISBN-10:
 1403993564

ISBN-13:
 9781403993564

Author:
 Horobin, Simon

Edition:
 

Publisher:
 Palgrave Macmillan

Studying Shakespeare on Film, Hindle, Maurice, 1403906734   Studying Shakespeare on Film
ISBN-10:
 1403906734

ISBN-13:
 9781403906731

Author:
 Hindle, Maurice

Edition:
 

Publisher:
 Palgrave Macmillan

Performances of Mourning in Shakespearean Theatre and Early Modern Culture, , 023000153X   Performances of Mourning in Shakespearean Theatre and Early Modern Culture
ISBN-10:
 023000153X

ISBN-13:
 9780230001534

Author:
 

Edition:
 

Publisher:
 Palgrave Macmillan

The Impact of Feminism in English Renaissance Studies, , 1403992126   The Impact of Feminism in English Renaissance Studies
ISBN-10:
 1403992126

ISBN-13:
 9781403992123

Author:
 

Edition:
 

Publisher:
 Palgrave Macmillan

The Feminization of Fame 1750-1830, Brock, Claire, 1403989915   The Feminization of Fame 1750-1830
ISBN-10:
 1403989915

ISBN-13:
 9781403989918

Author:
 Brock, Claire

Edition:
 

Publisher:
 Palgrave Macmillan

Iris Murdoch : A Re-Assessment, Rowe, Anne, 0230003443   Iris Murdoch : A Re-Assessment
ISBN-10:
 0230003443

ISBN-13:
 9780230003446

Author:
 Rowe, Anne

Edition:
 

Publisher:
 Palgrave Macmillan

Gothic Horror : A Guide for Students and Readers, , 0230001777   Gothic Horror : A Guide for Students and Readers
ISBN-10:
 0230001777

ISBN-13:
 9780230001770

Author:
 

Edition:
 2

Publisher:
 Palgrave Macmillan

English: the Condition of the Subject, , 1403988285   English: the Condition of the Subject
ISBN-10:
 1403988285

ISBN-13:
 9781403988287

Author:
 

Edition:
 

Publisher:
 Palgrave Macmillan

William Faulkner : A Literary Life, Rampton, David, 1403946809   William Faulkner : A Literary Life
ISBN-10:
 1403946809

ISBN-13:
 9781403946805

Author:
 Rampton, David

Edition:
 

Publisher:
 Palgrave Macmillan

Wordsmithery : The Writer's Craft and Practice, , 1403998280   Wordsmithery : The Writer's Craft and Practice
ISBN-10:
 1403998280

ISBN-13:
 9781403998286

Author:
 

Edition:
 

Publisher:
 Palgrave Macmillan

Writing Fiction : Creative and Critical Approaches, Boulter, Amanda, 1403988102   Writing Fiction : Creative and Critical Approaches
ISBN-10:
 1403988102

ISBN-13:
 9781403988102

Author:
 Boulter, Amanda

Edition:
 

Publisher:
 Palgrave Macmillan

Teaching African American Women's Writing, Wisker, Gina, 0230003486   Teaching African American Women's Writing
ISBN-10:
 0230003486

ISBN-13:
 9780230003484

Author:
 Wisker, Gina

Edition:
 

Publisher:
 Palgrave Macmillan

The Early Byzantine Historians, Treadgold, Warren, 1403934584   The Early Byzantine Historians
ISBN-10:
 1403934584

ISBN-13:
 9781403934581

Author:
 Treadgold, Warren

Edition:
 

Publisher:
 Palgrave Macmillan

The Changing Face of the Channel Islands Occupation : Record, Memory and Myth, Smith, Hazel Knowles, 1403988048   The Changing Face of the Channel Islands Occupation : Record, Memory and Myth
ISBN-10:
 1403988048

ISBN-13:
 9781403988041

Author:
 Smith, Hazel Knowles

Edition:
 

Publisher:
 Palgrave Macmillan