74 BULLETIN 1348. U. S. DEPARTMENT OF AGEICULTUBE 
Farmers' Bulletins — Continued. 
1296. Changes effected by tractors on Corn Belt farms. 
1297. Cost of using tractors on Corn Belt farms. 
1298. Cost of using horses on Corn Belt farms. 
1299. ShaU I buy a tractor? 
1300. Choosing a tractor. 
1314. Motor trucks on Corn Belt farms. 
Department of Commerce Publications 
Bureau of the Census Reports, 1840 to 1923. 
Commissioner of Labor Publications 
Thirteenth Annual Report. 
Smithsonian Institution Publications 
Analysis of electric service for rural homes. 
Energy resources of the United States. 
Power: Its significance and needs. 
STATE PUBLICATIONS 
Alabama : 
Circular 46. Tractor situation in Alabama. 
California : 
BuUetin 349. A study of side-draft and tractor hitches. 
Florida: 
Circular 12. Tractors in Florida. 
Idaho: 
Bulletin 111. Power farming in Idaho. 
Research Bulletin 2. Farm costs and relative profitableness of seven crops. 
lUinois : 
Engineering Bulletin 25. Lighting country homes by private electric plants. 
Bulletin 231. The horse and the tractor. 
BuUetin 238. Feeding farm work horses and mules. 
Circular 283. Hitching horses to get the most work done. 
Indiana: 
Circular 89. The farm tractor. 
Bulletin 10. Truck operating costs. 
Iowa: 
Engineering Bulletin 25. Electric power on the farm. 
Circular 63. The farm tractor in Iowa. 
Iowa farm costs and incomes in 1923. (Pubhshed by Iowa Farm Bureau.) 
Kansas : 
Engineering Bulletin 1. Illumination for the farm. 
Engineering Bulletin 9. Electric cooking appliances. 
Kentucky : 
Bulletin 222. Tractor experience in Kentucky. 
Bulletin 229. The cost of producing tobacco in Kentucky. 
Maryland: 
Bulletin 33. Cutting production costs with farm machinery. 
ISIichigan : 
Bulletins 164-165. Methods and results of tillage; draft of farm implements. 
Minnesota: 
Extension Bulletin 15. The cost of horse labor. 
Extension Bulletin 31. Shall I buy a tractor? 
Bulletin 145. The cost of producing Minnesota farm products, 1908-1912. 
Bulletin 179. The cost of producing Minnesota field crops, 1913-1917. 
Bulletin 205. A study of farm organization in southwestern Minnesota. 
Missouri : 
Engineering Bulletin 1. Economics of rural distribution of electric power. 
Bulletin 39. Draft of farm wagons. 
Bulletin 52. Draft of farm wagons. 
. Bulletin 152. Cost of horse labor on the farm. 
Bulletin 210. Agricultural engineering studies. 
Montana: 
Bulletin 151. The gas tractor in Montana. 
