United States. Department of Agriculture. (1956). Abstracts of recent published material on soil and water conservation. United States Department of Agriculture.
Chicago-čujuhus (17. p.)United States. Department of Agriculture. Abstracts of Recent Published Material on Soil and Water Conservation. Washington, D.C.: United States Department of Agriculture, 1956.
MLA-čujuhus (9. p.)United States. Department of Agriculture. Abstracts of Recent Published Material on Soil and Water Conservation. United States Department of Agriculture, 1956.
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