Chronic general periodontitis: "Periodontal disease" (Pyorrhoea alveolaris) / by J.F. Colyer.
- Frank Colyer
- Date:
- 1916
Licence: Public Domain Mark
Credit: Chronic general periodontitis: "Periodontal disease" (Pyorrhoea alveolaris) / by J.F. Colyer. Source: Wellcome Collection.
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