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- Ruth Hardy Wildflower and Fern Nursery.
- Ruth Hardy's Red Cedar Wildflower Nursery.
- Ruth Kunzman (Firm)
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- Ruth, Warren Albert, 1884-
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- Rutkowski, Thais
- Rutkowski, Tomasz
- Rutland, Henry John Brinsley Manners, 8th duke of, 1852-1925
- Rutland, Henry John Brinsley Manners, duke of, 1852-1925
- Rutland, R W R
- Rutledge, Archibald Hamilton, 1883-1973
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- Ruusscher, Melchior de.
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- Ruwenzori Expedition
- Ruwenzori-Kivu Expedition of the American Museum of Natural History (1926-1927)
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- Růžička, Vlastimil
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- Rybak, Michał
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- Rybkova, Romana
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- Rydeberg, PA
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- Ryder, John P.
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- Rye Nurseries.
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- Rymaszewska, Anna
- Rymer, James (James Francis)