1. Characteristics of an abnormal type of egg shell;Almquist;Poultry Sci.,1934
2. Variation and heredity of some characters in White Leghorns, Rhode Island Reds and Barnevelders;Axelsson;Lunds Universitets Arsskrift N. F., Avd. 2,1932
3. The relationship of clutch position and time interval between eggs to egg shell quality;Berg;Poultry Sci.,1945
4. Brooks, D.L. and K.B. Ellis, 1948. Unpublished data. Okla. Agr. Exp. Sta.
5. Factors influencing hatchability in the domestic fowl;Funk;Mo. Agr. Exp. Sta. Bull.,1934