1. A report on dental caries in 10,445 university students (1928–1930);Brekhus;JADA,1931
2. A second census of dental conditions in University of Minnesota freshmen students;Brekhus;JADA,1941
3. Fourth census of dental conditions in University of Minnesota freshmen students;Bartholdi;JADA,1961
4. Comparison of caries prevalence between freshman students in two Midwestern universities;Healey;JADA,1943