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Author
Johnson, R. Roy (Raymond Roy), 1932-
Published
Tucson : Cooperative National Park Resources Studies Unit, University of Arizona ; San Francisco : Western Region, National Park Service, Dept. of the Interior, [1983]
Online
Location
HathiTrust Digital Library >> Online Resource
Format
Books / Online
Author
Johnson, R. Roy (Raymond Roy), 1932-
Published
Fort Collins, Colo. : Rocky Mountain Forest and Range Experiment Station, 1982.
Online
Location
HathiTrust Digital Library >> Online Resource
Format
Books / Online