Obituary: Perry A. Ratcliff, DDS.
Oliver
Dick
D
Rio Verde, AZ, USA.
Wirthlin
Bob
B
D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D010517:Periodontics / Q000266:history*; D012953:Societies, Dental / Q000266:history*; D014481:United States