1. Relation of the keel bone to egg production;Asmundsen;In Scientific Agriculture, Vol. I, pp. 30-33, 63-67; also in Experiment Station Record,1921
2. Pigmentation and other criteria for the selection of laying hens;Blakeslee;Storrs, Conn., Agr. Exp. Sta. Bul.,1917
3. The value of various culling factors;Hervey;N. J. Agr. Exp. Sta., Hints to Poultrymen,1923
4. Correlation between external body characters and annual egg production in White Leghorn fowls, Texas Agr;Sherwood;Sta. Bul.,1922