Joint OIE-IABS Symposium on Clostridial Products in Veterinary Medicine Proceedings of the 48th symposium organized by the Internat. Office of Epizootics (OIE) and the Internat. Assoc. of Biological Standardization and held at the Head Office of the OIE, 12 rue de Prony, 75017 Paris, France 15-19 Sept. 1975 (Karger, 1976)