| American Library Association |
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| American Numismatic Society |
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| American Philosophical Society |
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| American Philosophical Society Library & Museum |
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| American Psychological Association |
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| American Public University System |
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| American Society of Landscape Architects |
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| American Theological Library Association |
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| American University |
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| American University in Cairo |
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| American University of Sharjah |
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| AmeriCorps |
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| Ames Public Library |
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| Amherst College |
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| Amigos Library Services |
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| Analog Devices |
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| Anchorage Museum |
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| Anderson University |
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| Andrew W. Mellon Foundation |
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| Anonymous |
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| Anti-Defamation League |
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| Anythink Libraries |
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| Appalachian State University |
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| Apple Inc. |
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| A Private Photo Archive & Art Collection |
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