1. The effect of varying levels of vitamin A in the hen ration on the vitamin A content of the egg yolk, on hatchability and on chick livability;Bearse;Poul. Sci.,1937
2. The vitamin D requirements of chickens;Carver;Wash. Agr. Exp. Sta. Bul.,1934
3. The comparative feeding values for poultry of barley, oats, wheat, rye, and corn;Crampton;Dominion of Canada National Research Council Rpt. 29.,1936
4. Feeding for eggs;Halpin;Wis. Univ., Col. of Agr., Ext. Cir. 141, 5th edition.,1934