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2. A Discussion on the Classification of the Avian Leucosis Complex and Fowl Paralysis
3. Proceedings of the Thirteenth Symposium of the Colston Research Society, Vol. XIII of the Colston Papers;Biggs,1962
4. Proceedings of the 3rd Congress of the World Veterinary Poultry Association;Biggs,1965
5. Proceedings of the 13th World's Poultry Congress;Biggs,1966