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1. Index to publications of the United States Department of agriculture, 1931-35

Description:: Also available on the Internet.
Author:: United States Dept. of Agriculture. Division of Publications.
Subject:: computer science , USDA , publications
Collection:: Organic Roots Collection
Year:: 1938

2. Soil-depleting, soil-conserving, and soil-building crops

Description:: Cover title.
Author:: Pieters, A. J.
Subject:: Crops and soils , Soil conservation , Soil management , soil quality , soil degradation , soil organic matter , soil conservation , conservation plants , soil resource management , grasses
Collection:: Organic Roots Collection
Year:: 1938