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Bitterroot National Forest, 1938
The effects of acidic deposition on Alberta agriculture : a review
List of texts and references in agriculture for secondary schools
National-forest vacations; United States Department of agriculture. Forest service
Elements of farm practice, prepared especially for teaching elementary agriculture
Lecture upon agriculture, and other suggestions upon the same subject
Question box : answers from entomologists of the U.S. Department of Agriculture
Elements of agriculture: for the use of primary and secondary schools
[Letter from Keith Shaffer to Library, United States Department of Agriculture]
Correlating agriculture with the public-school subjects in the Southern States