DEVELOPMENTS IN IMMUNOLOGY vol.5 536,207 Aging and immunity. Proceedings of an International Symposium, London, Ontario, Canada May 10 and 11, 1979. Ed.-s: S. K. Singhal and N. R. Sinclair, C. R. Stiller. New York 1979 Elsevier/North—Holland 8 s. XIII, nlb. 1, 240, il. Developments in Immunology vol. 5