1. The ages of breeding cattle and the possibilities of using proven sires;Lush;Iowa Agr. Exp. Sta. Bull.,1932
2. Dairy-herd-improvement associations and the stories the records tell;McDowell;U. S. Dept. Agr. Farmers’ Bull.,1929
3. Expecting death;Smith;The Ayrshire Cattle Society's Journal,1931
4. The average ages of cows and bulls in six breeds of cattle;Smith;J. Agr. Sc,1931