United States. Forest Service. Pacific Northwest Region
Date
1986
Edition
Revised in the Geometronics Service Center Office, Salt Lake City, Utah in 1981, additional base revisions have been made in 1982, supplemental recreation data added in 1982.
United States. Forest Service. Southwestern Region
Date
1985
Edition
Revisions and additions from 1977 maps by the USDA Forest Service Geometronics Service Center, Salt Lake City, Utah, and review by the Southwestern Region, 1985.