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Effect of an Erosion Control Program on Labor and ...
作者
Selmer A. Engene
出版1947
ISBN
UIUC:30112019648523
主題
Agriculture
An Analysis of the Relationship of the Relative Ra...
作者
Selmer Amund Engene
出版1940
ISBN
MINN:31951T000868683
主題
Agriculture
Agricultural Production and Types of Farming in Mi...
作者
Selmer A. Engene / George A. Pond
出版1940
ISBN
MINN:31951000405090X
主題
Agriculture
Agricultural Production and Types of Farming in Mi...
作者
Austin Allyn Dowell / Clifford Penny Fitch / Edward Fred Koller / Harold Henry Shepard / John Howard Allison / Joseph Oliver Culbertson / Selmer A. Engene / Warren Cleland Waite
出版1939
ISBN
UIUC:30112019645172
主題
Agricultural productivity