The influence of yeast upon fertility and hatchability of hens' eggs Lewis, Harry Reynolds, 1885- creator text book New York Fleischmann Co [192-?] 1920 1929
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ENG Birds Embryology Feeding and feeds Fertility Poultry Yeast https://www.biodiversitylibrary.org/bibliography/55428 63335225 10.5962/bhl.title.55428 NIC