An assessment of the forest and range land situation in the United States United States. Forest Service. contributor text book Washington, D.C The Service : for sale by the Supt. of Docs., U.S. GPO 1981 1981
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ENG October 1981. Forest management Forests and forestry Rangelands United States Forest resource report, no. 22 https://www.biodiversitylibrary.org/bibliography/66401 8173239000000 10.5962/bhl.title.66401 GAO