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Subjects: (William Ruggles),; 1809-1884; 1816-1882; 1820-1892; 1841-1914; Cactaceae; Correspondence; Engelmann, George,; Gerard, W. R.,; Hogg, Thomas,; Leggett, William Henry,; Letters; Opuntia rafinesquii; Pollination</div>
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Gerard, W. R.,</div>
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