Greeley, W. B., E. H. Clapp, H. A. Smith, R. Zon, W. N. Sparhawk, W. Shepard, and J. Kittredge. 1922. Timber, mine or crop? Two national problems: land use and timber supply . United States Department of Agriculture, Yearbook 1922:83-163.
Greeley et al. 1922
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