Department of the Interior, National Park Service : hearings before a subcommittee of the Committee on Appropriations, United States Senate, Ninetieth Congress, second session, on winter operation of roads in Yellowstone National Park.
|Corporate Author:||United States.|
Washington : U.S. G.P.O., 1968.
> Yellowstone National Park
> Maintenance and repair.
Yellowstone National Park.
iii, 105 p. ;
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