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ames agricultural experiment station
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Cilt sonuçları
Presenting economic information to consumers by television
Iowa. State College of Agriculture and Mechanic Arts, Ames. Agricultural Experiment Station. · Yayınevi bilinmiyor
74 sayfa · 1953
Television broadcasting
Let's save our soil
Iowa State College. Agricultural and Home Economics Experiment Station, Ames. Extension Service in Agriculture and Home Economics Iowa. State College of Agriculture and Mechanic Arts · Yayınevi bilinmiyor
23 sayfa · 1947
Soil conservation / Agriculture