Hollander, F. , and Dunning, J.M.: Study by Age and Sex of Incidence of Dental Caries in over 12,000 Persons, J. D. Res.18: 43, 1939.
2.
Klein H., Palmer, C.E., and Knutson, J.E.: Dental Status and Needs of Elementary School Children, Pub. Health Reports53: 751, 1938.
3.
Klein, H., and Palmer, C.E.: On the Epidemiology of Dental Caries. In Dental Caries. Monograph , Univ. of Pennsylvania, Bicentennial Conference , Philadelphia, 1941, University of Pennsylvania Press, pp. 1-25.
4.
Massler, M., Cohen, A., and Schour, I.: Epidemiology of Gingivitis in Children. I. Gingivitis in Philadelphia and Chicago School Children, J. A. D. A. (In press)
5.
Massler, M., and Savara, B.S.: Relation of Gingivitis to Dental Caries and Malocclusion in Children 14 to 17 Years of Age, J. Periodont. 22: 87, 1951.
6.
Massler, M., Schour, I., and Chopra, B.: Occurrence of Gingivitis in Suburban Chicago School Children, J. Periodont. 21: 146, 1950.
7.
Schour, I., and Massler, M.: Prevalence of Gingivitis in Young Adults, J. D. Res. 27: 7331948.