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.

Dades bibliogràfiques
Autor corporatiu: U.S. Soil Conservation Service
Format: Llibre
Idioma:English
Publicat: Washington, D. C. s.n. 1939.
Matèries:
Soil conservation > United States.