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Subjects: 1805-1877; 1809-1884; 1810-1888; 1817-1911; 1834-1895; 1837-1902; 1856-1937; Allen, Timothy Field,; Botanical specimens; Braun, Alexander,; Cassino, Samuel Edson,; Chara; Characeae; Correspondence; Eaton, Daniel Cady,; Engelmann, George,; Gray, Asa,; Hooker, Joseph Dalton,; Letters; Marsilea; Marsileaceae</div>
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Allen, Timothy Field,</div>
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