| Rothamsted Research |
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| Rothe |
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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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| 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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| Ruhr University Bochum |
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| Rutgers-Newark |
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| Rutgers University |
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| Rutgers University Libraries |
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| Ruth Lilly Medical Library, Indiana University School of Medicine |
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| Ryerson University |
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| Ryerson University Library |
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| Sacramento State University Library |
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| Safari Books Online |
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| Sage Publications |
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| Saint John's University |
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| Saint Joseph's University |
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