1. A balanced and an unbalanced ration fed prior to the hatching season as affecting the hatchability of eggs and the vigor of the progeny.;Atwood;W. Va. Agr. Exp. Sta. Bull.,,1927
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3. Nutritional factors affecting hatchability of eggs.;Heuser;Proc. Third World's Poultry Congress,1927
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5. “Poultry Husbandry,”;——;McGraw-Hill Book Co., Inc., New York City.,1930