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Credit
A treatise on pyorrha alveolaris (rigg's disease.) : a system for its prompt, positive and permanent cure / by Junius E. Cravens. Public Domain Mark. Source: Wellcome Collection.
Provider
This material has been provided by the University of Toronto, Harry A Abbott Dentistry Library, through the Medical Heritage Library. The original may be consulted at the Harry A Abbott Dentistry Library, University of Toronto.