1. (5) Cole W. E. Systems of Dairy Farming (1931), publ. by the College of Estate Management. (Private circulation.)
2. Inheritance of milk production;Gowen;Maine Agr. Exper. Stat. Bull,1924
3. Length of life of the dairy cow;M'Candlish;Scot. J. Agric,1930
4. (3) Buchanan Smith A. D. and Robinson O. J. The inheritance of milk yield. Proc. Internat. Dairy Cong. (1931).