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.

Bibliografiske detaljer
Institution som forfatter: U.S. Soil Conservation Service
Format: Bog
Sprog:English
Udgivet: Washington, D. C. s.n. 1939.
Fag:
Soil conservation > United States.