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.

Podrobná bibliografie
Korporativní autor: U.S. Soil Conservation Service
Médium: Kniha
Jazyk:English
Vydáno: Washington, D. C. s.n. 1939.
Témata:
Soil conservation > United States.