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. A comparison of two methods of supplying calcium to laying pullets;Berg;Wash. Bui.,1944
3. The effect of feeding grit on digestibility in the domestic fowl;Fritz;Poultry Sei.,1936
4. Essential minerals for chicks and laying hens;Kennard;Poultry Sei.,1925