Books by Walter J. Hartung:
Books in the extended shelves:
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Hartung, Walter J.: A field guide for forest indicator plants, sensitive plants, and noxious weeds of the Shoshone National Forest, Wyoming (U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Research Station, 2001), also by Kent E. Houston, Carol J. Hartung, United States Forest Service, and Rocky Mountain Research Station--Ogden (page images at HathiTrust)
Find more by Walter J. Hartung at your library, or elsewhere.