Correspondence
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Robert Caspary (1818-1887) Samuel Bowne Parsons (1819-1906) George W. Letterman (1840-1913) William Marriott Canby (1831-1904) Charles Sprague Sargent (1841-1927) Maxwell T. Masters (1833-1907) George Engelmann (1809-1884) Thomas C. Porter (1822-1901) S. B. Buckley (1809-1884) Joseph Dalton Hooker (1817-1911)