Skiing :
the National Forests, America's playgrounds /
Forest Service, U.S. Department of Agriculture.

APA Citation

United States. Forest Service. (1970). Skiing: the National Forests, America's playgrounds. Rev. August 1970 Washington, DC: The Service .

MLA Citation

United States. Forest Service. Skiing: the National Forests, America's Playgrounds. Rev. August 1970 Washington, DC: The Service , 1970.

Warning: These citations may not always be complete (especially for serials).