Sigafoos, Robert S.
Vegetation of Northwestern North America, as an aid in interpretation of Geologic Data / by Robert S. Sigafoos. -- Washington : United States Government Printing Office, 1958 - P. 165-183 + map. -- (Geological Survey Bulletin ; 1061-E).
Estados Unidos
Fitogeografía
581.9(73)
Vegetation of Northwestern North America, as an aid in interpretation of Geologic Data / by Robert S. Sigafoos. -- Washington : United States Government Printing Office, 1958 - P. 165-183 + map. -- (Geological Survey Bulletin ; 1061-E).
Estados Unidos
Fitogeografía
581.9(73)