318 LIST OF AUTHORITIES CONSULTED 



Oklahoma Geological Survey, Norman, Okla., Bulletin 1, Mineral Resources 

 of Oklahoma. 



Past, Present, and Future of the Plow Industry, J. L. Bowles. American 

 Exports, New York, March 1910. 



Transactions New York State Agricultural Society, 1867, Article by J. S. 

 Gould. 



Physics of Agriculture, F. H. King. 



Missouri Experiment Station, Bulletin 13, Draft Tests, J. W. Sanborn. 



Utah Experiment Station, Bulletins 4 and 7, Draft Tests, J. W. Sanborn. 



Draft of Plows, Thesis, C. A. Ocock. University of Illinois, 1904. 



Department of Agriculture, Saskatchewan, Bulletin 21, Methods of Soil 

 Cultivation, J. R. Motherwell. 



United States Department of Agriculture, Yearbook, 1909. The Farmers' 

 Cooperative Demonstration Work, S. A. Knapp. 



Office of Public Roads, Report to the Country Life Commission, 1908. 



Bureau of Statistics, Bulletin 49, Cost of Hauling Crops. 



Twelfth Census of the United States. 



Moto-Culture, A. Ph. Silbernagel. Oa Genie Rural, Paris. 



Miscellaneous Articles from: Implement and Machinery Review, London; 

 Canadian Thresherman and Farmer, Winnipeg, Man; Gas Power Age, 

 Winnipeg, Man; Modern Power, Winnipeg, Man.; American Thresher- 

 man, Madison, Wis.; Threshermen's Review, St. Joseph, Mich.; Gas Power, 

 St. Joseph, Mich.; Gas Review, Madison, Wis.; Gas Engine, Cincinnati, O., 

 Gas Energy, New York; Farm Implement News, Chicago; Farm Machinery, 

 St. Louis, Mo.; Irrigation Age, Chicago. 



World's Work, Garden City, N. Y., August, 1910, The Passing of the Man 

 with the Hoe, Edward A. Rumely. 



Papers by L. W. Ellis: 



Journal American Society of Mechanical Engineers, March 1911; The 

 Economic Importance of the Farm Tractor; United States Bureau of Plant 

 Industry, Bulletin 170; Traction Plowing. 



Transactions American Society Agricultural Engineers, 1910, Tractive 

 Efficiency. 



Proceedings National Gas and Gasoline Engine Trades Association, June, 

 1910, The Gas Tractor and the Horse. 



Proceedings North Dakota and Northwestern Minnesota Implement Dealers, 

 February, 1911, The Future of the Gas Tractor. 



La Hacienda, Buffalo, N. Y., August and September, 1910, The Traction 

 Engine in Dry Farming. 



Canadian Thresherman and Farmer, Winnipeg, Man., The Tractor vs. the 

 Horse, March 1910; Draft of Farm Implements, August, 1910; What Power 

 means to the Future, April 1911. 



American Tresherman, Madison, Wis., March 1911, Substitutes for Direct 

 Traction. 



Thresherman' s Review, St. Joseph, Mich., The Plows Behind the Engine, 

 Causes for Traction Failures. 



Gas Review, Madison, Wis., Traction Farming: A source of New Problems 

 in Farm Economics, March 1910; Fuels for Internal-Combustion Engines, 

 November 1910. 



THE COUNTRY LITE PRESS, GARDEN CIXY, N. Y. 



