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Broadhead, Garland C. Correspondence ?Broadhead (Garland) and Engelmann (George),; Broadhead to Engelmann, 1864-1882
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Synopsis of the Cactaceae of the Territory of the United States and Adjacent Regions /by George Engelmann.
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George, Engelmann Synopsis Of The Cactaceae Of The Territory Of The United States And Adjacent Regions /by George Engelmann