Hair, D. (1963). Economic importance of timber in the United States. U.S. Department of Agriculture, Forest Service.
Lua i Stíl Chicago (17ú heag.)Hair, Dwight. Economic Importance of Timber in the United States. Washington: U.S. Department of Agriculture, Forest Service, 1963.
Lua MLA (9ú heag.)Hair, Dwight. Economic Importance of Timber in the United States. U.S. Department of Agriculture, Forest Service, 1963.
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