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Bird H. R., 1942, FLOUR AND FEED, V43, P7
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CARVER JS, 1943, US EGG POULTRY MAG, V49, P141
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CASKEY CD, 1943, METHOD DETERMINING A
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CHRISTIANSEN J. B., 1940, POULTRY SCI, V19, P18, DOI 10.3382/ps.0190018
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Hammond John C., 1944, POULTRY SCI, V23, P49, DOI 10.3382/ps.0230049
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Hammond John C., 1942, POULTRY SCI, V21, P554, DOI 10.3382/ps.0210554