Author:Karl Andreas Geyer
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|←Author Index: Ge||Karl Andreas Geyer
- Carl Andreas Geyer
- Charles A. Geyer
- Karl Andreas Geyer
- Charles A. Geyer's Botany Journal written on Joseph N. Nicollet's 1838 expedition to survey the Missouri and Mississippi rivers.
- Notes on the vegetation and general character of the Missouri and Oregon territories: made during a botanical journey from the State of Missouri across the south-pass of the Rocky Mountains to the Pacific during the years 1843 and 1844.
- Chronik des Gartenwesens und Feuilleton der Isis: Organ für Gärtner, Gartenbesitzer, Garten- u. Naturfreunde (1851-1853).
- Charles A. Geyer, pioneer botanist of upper Oregon by Thomas R Cox, (Boise, ID : Idaho State Historical Society, 1999)