1. Bacterial Infection;Appleton,1944
2. University of Pennsylvania B. Centennial Conference;Bibby,1941
3. Gelatine Forming Microorganisms;Black;Independent Practitioner,1886
4. Dr. Black's Conclusions Reviewed Again;Black;Dental Cosmos,1889
5. Direct Microscopic Study of Plaque Material;Blayney;J. D. Res,1936