Hansen, Wallace R., 1920-

The Black Canyon of the Gunnison, today and yesterday, by Wallace R. Hansen. - [Washington, For Sale by the Superintendent of Documents, U. S. Govt. Print. Off., 1965] - vii, 76 p. illus., maps. 24 cm.

Bibliography: p. 75-76.

gs 65000326


Geology--Colorado--Black Canyon.

QE75 / .B9 no. 1191