1. Influence of various grits on battery-raised broilers;Cooney;Oregon Circ.,1941
2. Die Zugabe von Kalksteingrit und Flintgrit zum Futter bei der Jungmast von Hähnchen;Ferber;Archiv, für Geflügelkunde,1933
3. Heuser, G. F., 1941. Gizzard development in chickens. Poultry Current Science and Practice No. 2:2-4. June (Poultry Dept.,' Cornell University).
4. The influence of commercial limestone and mica grits upon growth, feed utilization, and gizzard measurements of chicks;Platt;New Jersey Bui.,1935
5. Fine versus coarse grit as a feed ingredient for poultry;Tepper;N.H. Circ.,1939