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Subjects: 1809-1884; 1826-1901; 1854-1937; Abies; Botanical specimens; Cactaceae; Cascade Range; Collectors and collecting; Coniferae; Correspondence; Echinocactus; Effect of altitude on; Engelmann, George,; Identification; Juniperus; Letters; Meehan, Thomas,; Pinaceae; Pinus; Plants; Taxaceae; Taxus; Tsuga; Tweedy, Frank,</div>
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Tweedy, Frank,</div>
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