Viereck, Leslie A., author.
Portland Or. (333 S.W. First Ave., P.O. Box 3890, Portland 97208) : United States Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1992.
1992
United States. Federal Geographic Data Committee. Vegetation Subcommittee. Hierarchy Revisions Working Group, author.
Fort Collins, CO : United States Department of Agriculture, Forest Service, Rocky Mountain Research Station, August 2016.
2016-