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This is issue 3: Accuracy of the Topographic Abney in Long-Distance Sighting
Forests and Forestry--Montana
University of Montana (Missoula, Mont. : 1965-1994). School of Forestry. Montana Forest and Conservation Experiment Station
University of Montana--Missoula. Mansfield Library. Archives and Special Collections
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University of Montana--Missoula. Mansfield Library
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Lange, Robert W., "Research Notes, April 1966" (1966). Montana Forestry Notes and Research Note, 1964-1992. 3.