INTERNATIONAL 192,934 International Symposium on Smallpox Vaccine, Proceedings of the 37th Symposium Organized by the International Association of Biological Standardization and held at the Rijks Instituut voor de Volksgezongheid, Biltho-ven, The Netherlands 11-13 October 1972. Ed. R. H. Regamey and H. Cohen. Basel 1973 S. Karger 4° s. XII, 365, ilustr. Symposia Series in Immunobiological Standardization vol. 19.