![In Our Opinion: The Preparation for Certification in Periodontology]()
In Our Opinion: The Preparation for Certification in PeriodontologyLeonard, Harold J.; Agnew, R. Gordon; Bettman, M. Monte; Bryan, A. W.; Glickman, Irving; Holliday, Houghton; Lyons, Harry; McCall, John Oppie; Merritt, Arthur H.; Ziskin, Daniel E. · Journal of Periodontology · 1947