FARMERS ' EARNINGS IN SOUTHEASTERN PENNSYLVANIA 63 
LITERATURE CITED 
(1) App, Frank, and Wright Hoffman. 
1924. The Marketing of Milk in Philadelphia. U. S. Dept. Agr., Bur. 
Agr. Economics. Preliminary Report. Mimeographed. 
(2) Armsby, Henry P. 
1916. The use of Energy Values in the Computation of Rations for Farm 
Animals. U. S. Dept. Agr. Bui. 459. 
(3) Billings, George A. 
1917. Seasonal Distribution of Farm Labor in Chester County, Pa. 
U. S. Dept. Agr. Bui. 528. 
(4) Chambers, C. R. 
1924. Relation of Land Income to Land Value. U. S. Dept. Agr. Bui. 
1224. 
(5) Ezekiel, Mordecai. 
1924. A Method of Handling Curvilinear Correlation for any Number of 
Variables. Jour. Amer. Statistical Assoc, Vol. XIX, New Series, 
No. 148, Dec, pp. 431-453. 
(6) 
1925. The Assumptions Implied in the Multiple Regression Equation. 
Jour. Amer. Statistical Assoc, Vol. 20, New Series, No. 151, 
Sept., pp. 405-408. 
(7) 
1925. A Statistical Test of Measures of Farmers' Financial Success. 
Journal of Farm Economics, Vol. 7, No. 4, Oct. 
(8) 
The Determination of Curvilinear Regression Surfaces in the Presence of 
Other Variables. Jour. Amer. Stat. Assoc, (in press). 
(9) Grimes, W. E. 
Measures of Income from Farming. Manuscript filed in the library of 
the Universitv of Wisconsin. 
(10) J. A. Hodges, R. D. Nichols, and J. W. Tapp. 
1925. A Study of Farm Organization in Central Kansas. U. S. Dept. Agr. 
Bui. 1296. 
(11) Haas, G. C. 
1922. Sale Prices as a Basis for Farm Land Appraisal. Minn. Agr. Exp. 
Sta. Bui. 9. 
(12) Henry, W. A., and F. B. Morrison. 
1923. Feeds and Feeding. 
(13) Mills, F. C. 
1925. Statistical Methods. 
(14) Rabild, Helmer, H. P. Davis, and W. K. Brainerd. 
1916. The Feeding of Dairy Cows. U. S. Dept. Agr. Farmers' Bui. 743. 
(15) Sheets, E. W., and William Jackson. 
1924. A Handbook for Better Feeding of Livestock. U. S. Dept. Agr. 
Misc. Circ. 12. 
(16) Smith, Bradford B. 
1925. Forecasting the Acreage of Cotton. Jour. Amer. Statistical Assoc, 
Vol. XX, New Series, No. 149, March, pp. 31-47. 
(17) Sfillman, W. J., H. M. Dixon, and G. A. Billings. 
1916. Farm Management Practice of Chester County, Pa. U. S. Dept. 
Agr. Bui. 341. 
(18) Taylor, H. C. 
1921. Agricultural Economics. 
(19) Tolley, H. R., and M. J. B. Ezekiel. 
1923. A Method of Handling Multiple Correlation Problems. Jour. Amer. 
Statistical Assoc, Vol. XVIII, New Series, No. 144, Dec, pp. 
993-1002. 
(20) Tolley, H. R., J. D. Black, and M. J. B. Ezekiel. 
1924. Input as Related to Output in Farm Organization and Cost-of- 
Production Studies. U. S. Dept. Agr. Bui. 1277. 
(21) Farmers' Use of Automobiles. U. S. Dept. Agr., Crops and Markets, Monthly 
Supplement, vol. 1, No. 1, Jan., 1924, p. 3. 
