Proceedings of the 25th symposium organized by the permanent Section of Microbiological Standardization

Jacob Derk van Ramshorst, P. A. van Hemert, Netherlands) International Symposium on Pertussis (2d 1969 Bilthoven, International Association of Microbiological Societies. Permanent Section of Microbiological Standardization, R. H. Regamey, J. D. van Ramshorst