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The Alaska vegetation classification

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

Classification and description of world formation types

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-

Vegetation classification for South Florida natural areas

Rutchey, Ken.
Reston, VA : U.S. Geological Survey, 2006. 2006