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.

מידע ביבליוגרפי
מחבר תאגידי: U.S. Soil Conservation Service
פורמט: ספר
שפה:English
יצא לאור: Washington, D. C. s.n. 1939.
נושאים:
Soil conservation > United States.