AN APPRAISAL OF POWER USED ON FARMS 75 
Nebraska: 
Bulletin 177. The Nebraska tractor tests. 
New Hampshire: 
Extension Circular 47. Tractors in New Hampshire . 
New Jersey: 
Bulletin 294. Farm profits on 370 potato farms in Monmouth County, N. J. 
Bulletin 312. Farm profits on 284 general farms and 75 dairy farms in 
Monmouth County, N. J. 
Bulletin 320. Farm profits on 460 dairy farms in Sussex County, N. J. 
'^Bulletin 386. Tractor farming in New Jersey. 
Report of the department of agronomy and farm management. (Labor 
requirements of crops.) 
New York: 
y^BuUetin 405. An economic study of farm tractors in New York. 
Bulletin 414. Cost accounts for six years on some successful New York 
farms. 
Bulletin 427. Farm motor trucks in New York. 
Extension Bulletin 90. Artificial illumination of poultry houses for winter 
egg production. 
North Dakota: 
Circular 57. Farm costs and farm organization. 
''Bulletin 165. Cost of production and farm organization. 
Ohio: 
Extension Bulletin 5. The labor required for crop production in Ohio. 
Oregon: 
Bulletin 2. Elementary primer of electricity for light and power customers. 
Pennsylvania : 
Engineering Bulletin 6. Electric light and power for country homes. 
Bulletin 158. An economic study of the gas tractor in Pennsylvania. 
South Carolina: 
Bulletin 48. Broad and narrow tires. 
South Dakota: 
Circular 4. Handbook on South Dakota farm production costs. 
Utah: 
Bulletin 6. Trial of sleds and tillage tools. 
Bulletin 7. Draft of mowing machines. 
Bulletin 165. Labor costs and seasonal distribution of labor on irrigated 
crops in Utah Valley. 
West Virginia: 
Bulletin 163. Amount and cost of labor required for growing crops in West 
Virginia. 
Bulletin 180. The farm tractor in Mason and Berkeley Counties. 
Wisconsin : 
Extension Circular 163. Turn on the light. (Farm lighting systems.) 
BOOKS RELATING TO FARM POWER 
Farm Machinery and Farm Motors, Davidson and Chase. Orange Judd Co., 
•New York. 
Farm Equipment, Kranich. The Macmillan Co., New York. 
Fatm Implements and Machinery, Bond. Benn Bros., London. 
Engineering on the Farm, Stewart. Rand, McNally & Co., Chicago. 
The Animal as a Machine and a Prime Mover, Thurston. John Wiley & Sons, 
New York. 
The Windmill as a Prime Mover, Wolff. John Wiley & Sons, New York. 
Agricultural Engineering, Davidson. Webb Pub. Co., St. Paul. 
Equipment for the Farm and the Farmstead, Ramsower. Ginn & Co., New York. 
Physics of Agriculture, King. Madison, Wis. 
Farm Motors, Potter, McGraw-Hill Book Co., New York. 
Modern Farm Machinery, McHardy. Methuen & Co., London. 
SOCIETIES AND ORGANIZATIONS 
Transactions and Journal American Society of Agricultural Engineers. 
Journal and Handbook Data, Society of Automotive Engineers. 
The Influence of Farm Machinery on Production and Labor, Quaintance. 
American Economic Association. 
Distribution of Incomes in 1919, National Bureau of Economic Research. 
