Hansen, Wallace R. 1920-
The black Canyon of the Gunnison : today and yesterday / by Wallace R. Hansen. -- Washington : United States Government Printing Office, 1965 - 76 p. -- (Geological Survey Bulletin ; 1191).
Estados Unidos
Geología
55(73)
The black Canyon of the Gunnison : today and yesterday / by Wallace R. Hansen. -- Washington : United States Government Printing Office, 1965 - 76 p. -- (Geological Survey Bulletin ; 1191).
Estados Unidos
Geología
55(73)