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.

Détails bibliographiques
Collectivité auteur: U.S. Soil Conservation Service
Format: Livre
Langue:English
Publié: Washington, D. C. s.n. 1939.
Sujets:
Soil conservation > United States.