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Subjects: 1794-1873; 1809-1884; 1815-1895; 1826-1901; 1831-1904; 1842-1893; Academy of Natural Sciences of Philadelphia; Canby, William Marriott,; Correspondence; Durand, Elias,; Engelmann, George,; Herbarium; Letters; Martindale, Isaac C.,; Meehan, Thomas,; Redfield, John Howard,</div>
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Redfield, John Howard,</div>
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