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Asmundson V. S., 1944, POULTRY SCI, V23, P21, DOI 10.3382/ps.0230021
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Asmundson V. S., 1942, POULTRY SCI, V21, P505, DOI 10.3382/ps.0210505
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Bird S., 1945, U S EGG AND POULTRY MAG, V51, P206
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GUTTERIDGE H. S., 1942, SCI AGRIC [OTTAWA], V22, P378
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Harshaw H. M., 1943, POULTRY SCI, V22, P126, DOI 10.3382/ps.0220126
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HOLMES CF, 1942, TURKEY WORLD, V17, P16
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JAAP R. GEORGE, 1938, POULTRY SCI, V17, P425, DOI 10.3382/ps.0170425
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JAAP R. GEORGE, 1938, POULTRY SCI, V17, P120, DOI 10.3382/ps.0170120
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JAAP RG, 1939, 7TH P WORLDS POULTR, P68