Poultry genetics and breeding : proceedings of the 18th Poultry Science Symposium, in association with the 25th British Poultry Breeders Round Table, 1983 / organized by the Joint Standing Committee of British Poultry Science Ltd, and World's Poultry Science Association (United Kingdom) Ltd / edited by W.G. Hill, J.M. Manson and D. Hewitt ; sponsors, Arbor Acres Farm Inc. ... [et al.]. (Poultry Science Symposium series ; 18)