1. Differentiation of Types of Poliomyelitis Viruses. I. Reinjection Experiments in Monkeys (Second Attacks);Bodian;Am. J. Hyg.,1949
2. II. By Reciprocal Vaccination-Immunity Experiments;Morgan;Am. J. Hyg.,1949
3. III. The Grouping of Fourteen Strains into Three Basic Immunological Types;Bodian;Am. J. Hyg.,1949
4. Immunologic Groups of Poliomyelitis Viruses;Kessel;Am. J. Hyg.,1950
5. Immunologic Relations and Comparative Invasiveness of Strains of Poliomyelitis From Recent Epidemics;Brown,1949