EnvironmentMass Production in AgricultureLarge-Scale Farming Operations May Be Revolutionized By Means of Tractors Powered With Diesel EnginesBy Henry W. Hough on January 1, 1930AdvertisementABOUT THE AUTHOR(S)Recent Articles by Henry W. HoughWhen Crude Oil Crosses The SeasA Gallon of 'Gas' from a Gallon of OilMining Coal With Mammoth Shovels