Correspondence between Paul N. Baer and Sigurd P. Ramford.
Baer
Paul N
PN
D015709:Correspondence as Topic / Q000266:history; D049673:History, 20th Century; D006801:Humans; D017622:Periodontal Attachment Loss / Q000266:history; D010517:Periodontics / Q000266:history*; D009626:Terminology as Topic