Conservation of the soil; a unit for elementary schools developed by the Fairbrother-Rossell School, in cooperation with the Soil Conservation Service, USDA.

Conservation of the soil; a unit for elementary schools developed by the Fairbrother-Rossell School, in cooperation with the Soil Conservation Service, USDA.

Bibliografske podrobnosti
Korporativna značnica: U.S. Soil Conservation Service
Format: Knjiga
Jezik:English
Izdano: Washington, D. C. s.n. 1939.
Teme:
Soil conservation > United States.