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| Centro de Referência em Informação Ambiental, CRIA | Centro Latinoamericano de Economía Humana |
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| Centro Nacional de Investigaciones Metalurgicas | Centro Regional de Investigaciones Cientificas y Tecnológicas |
| Centro Universitário de Maringá – CESUMAR | Ceramic Society of Japan |
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| CFO Publishing Corporation | CGA-Canada |
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| Cheryl McLean | Chicago Bar Association |
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| Chinese University of Hong Kong | Chip Scale Review |
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| Christian Computing Magazine | Christian Ethics Today Foundation |
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| CHZ Ars Polona S.A. | CIB - University of Bologna |
| Cigar Aficionado Online | Cinahl Information Systems |
| Cio Communications Inc | Cipav |
| Circuit Cellar | CIRP |
| Cisco Systems, Inc. | Città Aperta Edizioni |
| City College of New York | City University of New York |
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| Clark University | Classical Association of Canada |
| Classical Association of South Africa | Classical Association of the Atlantic States |
| Classical Association of the Middle West and South | Clay Minerals Society |
| Clay Minerals Society of India | CLB Media Inc |
| Cleveland Clinic Foundation | Cleveland Magazine |
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| Climbing Magazine | Clinical and Experimental Rheumatology |
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| Clinical Laboratory Publications | Clinical Nephrology |
| Clinical Publishing | Clinician Reviews |
| Closing The Gap | Clute Institute for Academic Research |
| CMC Alumni Vellore Association | CMP Media LLC |
| CMYK Multimedia Pvt. Ltd. | Co-Action Publishing |
| Coastal Education and Research Foundation | Cobblestone Publishing Company |
| Cochrane Collaboration | Coconut Research Institute of Sri Lanka |
| Codata | CodeBreakers Journal |
| Coffee Board of India | Cognitive Development Society |
| Cognitive Science Society | Cognizant Communication Corporation |
| Cold Spring Harbor Laboratory Press | Colégio Brasileiro de Cirurgiões |
| Colegio de Médicos y Cirujanos de Costa Rica | Colegio de Postgraduados |
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| College Music Society's South Central Chapter | College of American Pathologists |
| College of Anaesthesiologists of Sri Lanka | College of Criminology and Criminal Justice |
| College of Education | College of Education, Idaho State University |
| College of Emergency Nursing Australasia | College of Family Physicians of Canada |
| College of Family Physicians, Singapore | College of Information Technology |
| College of Nyíregyháza | College of Optometrists |
| College of Optometrists in Vision Development | College of Pathologists |
| College of Physicians and Surgeons Pakistan | College of Radiographers |
| College of Registered Nurses of British Columbia | College of Saint Elizabeth |
| College of Statistical and Actuarial Sciences | College of Surgeons of Hong Kong |
| College of Surgeons of Sri Lanka | College of Textiles |
| College of The Bahamas | College on Problems of Drug Dependence |
| College Sport Research Institute | College Writing Programs |
| Colorado Bar Association | Colorado State University |
| Columbia College | Columbia Law Review |
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| Columbia Publishing | Columbia Theological Seminary |
| Columbia University | Columbus School of Law |
| Columbus State University | Combat Law Publications Pvt Ltd |
| Comenius University | Commentary |
| Committee for Skeptical Inquiry | Committee In Charge of the Artis Library |
| Committee on Data for Science and Technology | Committee on Space Research |
| Common Ground Publishing Corp | Commonwealth Business Media |
| Commonwealth Forestry Association | Commonwealth Institute |
| Commonwealth Parliamentary Association | Commonwealth Secretariat |
| Communication and Hypertext Links for Online Education | Communication Institute for Online Scholarship |
| Communications in Information Literacy | Communications in Mathematical Analysis |
| Communications Network | Communist Party of India |
| Communist Party, USA | Community Aids Treatment Information Exchange |
| Community Broadcasting Association of Australia | Community College National Center for Community Engagement |
| Community Practitioners' and Health Visitors' Association | Company of Biologists Ltd |
| Competition Master | Computer Bits Online |
| Computer Law Review & Technology Journal | Computer Review |
| Computer Science Journals | Computer Society of South Africa |
| Computer Vision Center | Computerized Medical Imaging Society |
| ComputerUser.com Inc | ComputerWire |
| Computerworld | Computhink Inc |
| ComputorEdge Magazine | ComSIS Consortium |
| Conciliation Resources | Concordia University |
| Conde Nast Publications Inc | Conference Board Inc. |
| Conférence des recteurs et principaux des universités du Québec | Conference of Socialist Economists |
| Congenital Cardiology Today | Congress of Neurological Surgeons |
| Congress of Polish Society of Pathologists | Conley Magazines Llc |
| Connect Journals | Conscious Communications Inc |
| Conscious Enlightenment publications | Conscious Enlightenment Publishing |
| Consejo Mexicano de Investigacion Educativa A.C | Consejo Mexicano de Investigación Educativa, A.C. |
| Consejo Superior de Investigaciones Científicas | Conservation Law Foundation |
| Consortium on Peace Research, Education and Development | Constructii |
| Consumer Education and Research Centre | Consumers Union of U.S. |
| Contact in Context | Contact Lens Association of Ophthalmologists, Inc. |
| Contemporary Aesthetics | Contemporary Educational Technology |
| Contemporary Media, Inc. | ContentWorld Ventures |
| Continuing Medical Education, Inc. | Continuum International Publishing Group |
| Control Publications | Controlled Release Society |
| Convergence Plus | Conway Data Inc. |
| Cooling Technology Institute | Cooltown Program |
| Cooper Ornithological Society | Copernicus GmbH |
| Copper Creek | Coquina Press |
| Core Medical Publishing | Cornell International Law Journal |
| Cornell Law School | Cornell University |
| Cornell University School of Hotel Administration | Cornetis Medical Publishing House |
| Corporate Council on Africa | Corporate Knights Inc. |
| Corporation for National Research Initiatives | Corry Publishing, Inc. |
| Cortex | Cortlandt Forum |
| Cosmos Publishing Cooperative | COTA National Seniors |
| Cotton Foundation | Council for British Archaeology |
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| Council for Secular Humanism | Council for the Development of Social Science Research in Africa |
| Council of Australian Humanist Societies | Council of Scientific and Industrial Research |
| Council of Societies for the Study of Religion | Council of Supply Chain Management Professionals |
| Council on Biblical Manhood and Womanhood | Council on Foreign Relations |
| Council on Social Work Education | Countryside & Small Stock Journal |
| CPA Australia | CPR Institute for Dispute Resolution |
| Cps Communications, Inc. | Craft Australia Research Centre |
| Crain Communications Inc. | Cranfield School of Management |
| Cranfield University | CRC Press |
| Creative Commons | Creative Decisions Foundation |
| Creative Education Foundation | Credit Union Journal and SourceMedia, Inc. |
| Credit Union National Association, Inc. | Creighton University |
| Criminal Justice Program | Criminological Society of South Africa |
| Crisis Magazine | Critical Ceramics |
| Critical Social Work | Croatian Academy of Sciences and Arts |
| Croatian Anthropological Society | Croatian Cartographic Society |
| Croatian Chemical Society | Croatian Entomological Society |
| Croatian Geographical Society | Croatian Geological Society |
| Croatian Medical Journal | Croatian Metallurgical Society |
| Croatian Natural History Museum | Croatian Pharmaceutical Society |
| Croatian Physical Society | Croatian Scientific Society for the History of Health Culture |
| Croatian Society for Geometry and Graphics | Croatian Society of Chemical Engineers |
| Croatian Society of Medical Biochemists | Croatian Society of Natural Sciences |
| Croatian Sociological Association and Jesenski & Turk Publishing House | Crop Protection Research Centre |
| Crop Science Society of America | Crop Science Society of China |
| Crop Science Society of Japan | Crustacean Society |
| Cryogenic Association of Japan | CryoLetters LLP |
| CSIRO Publishing | CTE Publications Inc. |
| Ctheory.net | CTI Centre for Textual Studies |
| CTO Data Services Co. | Cukurova University Faculty of Medicine |
| Cultural Survival | CulturalLogic |
| Culture Domain | Culture,Philosophy and Arts Research Institute |
| Cumberland School of Law at Samford University | Cuneiform Digital Library Initiative |
| Current Digest of The Post-Soviet Press | Current Drug Discovery |
| Current History, Inc | Current Medicine Group LLC |
| Current Science Association | Current Science Inc |
| Curso de Pós-Graduação em Ciências Geodésicas | CurtCo/SDM, LLC |
| Curtin Business School International | Curtin University of Technology |
| Curzon Press | Cutter Consortium |
| Cyber Media (India) Limited | Cybrarians Group |
| Cygnus Business Media | Czech Academy of Agricultural Sciences |
| Czech and Slovak Crystallographic Association | Czech Botanical Society |
| Czech Chemical Society | Czech Geological Survey |
| Czech Society for Systems Integration | Czech Technical University in Prague |
| Czech University of Life Sciences Prague | Czech-Moravian Psychological Society |
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