| Rockefeller Archive Center |
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| Rockefeller University |
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| Roger Williams University |
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| Rollins College |
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| Roman Catholic Archdiocese of Atlanta |
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| Roosevelt University |
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| Roper Center for Public Opinion Research |
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| ROR - Research Organization Registry |
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| Rose-Hulman Institute of Technology |
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| Roseman University of Health Sciences |
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| Rose Memorial Library Association Central Library |
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| Rothamsted Research |
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| Rowan University |
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| Rowan University Libraries |
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| Rowman & Littlefield |
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| Royal Botanic Gardens, Kew |
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| Royal British Columbia Museum |
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| Royal College of Physicians |
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| Royal Netherlands Academy of Arts and Sciences |
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| Royal Ontario Museum |
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| RPA Santa Monica |
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| RR Donnelley |
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| Rutgers-Newark |
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| Rutgers University |
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| Rutgers University Libraries |
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