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HAMMOND JOHN C., 1942, POULTRY SCI, V21, P230, DOI 10.3382/ps.0210230
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HUTT F. B., 1929, POULTRY SCI, V8, P202
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JAAP R. GEORGE, 1938, POULTRY SCI, V17, P425, DOI 10.3382/ps.0170425
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JAAP RG, 1940, US EGG POUL MAG, V46, P668
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JAAP RG, 1938, US EGG POULT MAG, V44, P488
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JAAP RG, 1938, US EGG POUL MAG, V44, P489
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JAAP RG, 1938, US EGG POUL MAG, V44, P503
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LATIMER HB, 1927, AM J ANAT, V40, P2
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LERNER I. MICHAEL, 1937, HILGARDIA, V10, P511
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LERNER I. MICHAEL, 1937, POULTRY SCI, V16, P213, DOI 10.3382/ps.0160213