Abstract: | Bird Keeping as a Source of Lung Cancer and Other Human Diseases. A need for higher hygienic standards. By P.A.J. Holst, 1991, 123 pp. Berlin, Heidelberg, New York, not illustrated, £20. Springer‐Verlag. ISBN 3–540 53555 1, 0 387 53555–1. In vitro Digestion for Pigs and Poultry. Edited by M. E. Fuller, 1991, x + 209 pp., Wallingford, CAB International. £30.00 ISBN 0 85 198 719–2. |