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作者	Hansen, Wallace R., 1920-

標題 The Black Canyon of the Gunnison, today and yesterday, by Wallace R. Hansen.

出版資料	[Washington, For Sale by the Superintendent of Documents, U. S. Govt. Print. Off., 1965]

說明	vii, 76 p. illus., maps. 24 cm.
系列	Geological Survey (U.S.) Bulletin 1191
	Geological Survey bulletin ; 1191.
With:	Bound With: Geology and ground-water resources of the Pica area, Tarapaca Province, Chile,
Bibliography	Bibliography: p. 75-76.
主題	Geology -- Colorado -- Black Canyon.
政府出版物號碼	I 19.3:1191