| Robert E. Kennedy Library, Cal Poly San Luis Obispo |
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| Robertson Library, University of Prince Edward Island |
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| Roberts Wesleyan College |
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| Rochester Institute of Technology |
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| Rochester Institute of Technology - The Wallace Center |
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| Rock and Roll Hall of Fame |
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| 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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| Rowan University Libraries (Rowan, NJ) |
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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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