United States. Forest Service. North Pacific Region. Public Relations Office. (1932). What is forestry?: An outline for classes in economics, geography and nature study in high schools of Washington.
Style de citation Chicago (17e éd.)United States. Forest Service. North Pacific Region. Public Relations Office. What Is Forestry?: An Outline for Classes in Economics, Geography and Nature Study in High Schools of Washington. Portland, 1932.
Style de citation MLA (8e éd.)United States. Forest Service. North Pacific Region. Public Relations Office. What Is Forestry?: An Outline for Classes in Economics, Geography and Nature Study in High Schools of Washington. 1932.
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