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.

Detaylı Bibliyografya
Müşterek Yazar: U.S. Soil Conservation Service
Materyal Türü: Kitap
Dil:English
Baskı/Yayın Bilgisi: Washington, D. C. s.n. 1939.
Konular:
Soil conservation > United States.