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Subjects: 1809-1884; 1824-1902; 1831-1920; 1841-1927; 1849-1901; Abies; Correspondence; Dawson, George Mercer,; Dispersal; Engelmann, George,; Fagaceae; Identification; Juncaceae; Letters; Macoun, John,; Northwestern States; Pinaceae; Pinus; Plants; Quercus; Sargent, Charles Sprague,; Selwyn, Alfred Richard Cecil,; Trees</div>
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Dawson, George Mercer,</div>
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