Author:Karl Andreas Geyer
|←Author Index: Ge||Karl Andreas Geyer
Name variants 
- 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)
|Works by this author published before January 1, 1923 are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.|