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.

Detalhes bibliográficos
Autor Corporativo: U.S. Soil Conservation Service
Formato: Livro
Idioma:English
Publicado em: Washington, D. C. s.n. 1939.
Assuntos:
Soil conservation > United States.