| Copyright Clearance Center |
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| Corbis |
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| Cornell College |
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| Cornell Laboratory of Ornithology |
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| Cornell University |
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| Cornell University Library |
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| Corning Museum of Glass |
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| CoSector, University of London |
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| Council of Prairie and Pacific University Libraries |
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| Council on Foreign Relations |
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| Council on Library and Information Resources |
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| Country Music Hall of Fame and Museum |
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| County of Los Angeles Public Library |
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| Courtney McClellan, Innovator in Residence at the Library of Congress |
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| Crain Communications |
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| Cranbrook Center for Collections and Research |
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| Cranbrook Educational Community |
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| Creative Commons |
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| Creighton University |
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| Crossref |
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| CSULB University Library |
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| CUNY Graduate Center |
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| CUNY Queens College |
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| CUPA-HR |
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| Curry College |
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