Economic impact of the oil shale industry in western Colorado. Hearing, Ninety-third Congress, second session .

by United States. Congress. Senate. Committee on Interior and Insular Affairs. Subcommittee on Public Lands.
Published: U.S. Govt. Print. Off., 1974

Colorado wilderness areas. Hearing, Ninety-third Congress, first session, on S. 702 .

by United States. Congress. Senate. Committee on Interior and Insular Affairs. Subcommittee on Public Lands.
Published: U.S. Govt. Print. Off., 1973