1. The use of calcite and other natural deposits of calcium carbonate in the ration of laying hens;Alder;World's Poultry Congress Proc. (Canada),1927
2. What's new in feeding: Size of particle in oyster shells;Anonymous;Feedstuffs,1946
3. Machines and feed separation;Bird;Proc. School for Feed Men,1969
4. Calcium metabolism in the laying hen;Buckner;Kentucky Agric. Exp. Sta. Bul.,1923
5. Studies on calcium and phosphorous separation in laying feeds;Charles;Feedstuffs,1969