What is farming?

By Larson, Gustav Edward,.
New York, D. Van Nostrand co., inc. 1945 .
x, 410 p. , "Originally prepared for the United States Armed forces institute... revised and adapted for civilian use with the consent of the War department." -p. vii. | Another ed., with same title, was published in 1944 for the U. S. Dept. of agriculture. 21 cm..

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New riches from the soil; the progress of chemurgy,

By McMillen, Wheeler, .
New York, D. Van Nostrand Co., inc. 1946 .
xii, 397 p. 22 cm..

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What is farming?

New riches from the soil; the progress of chemurgy,