Practical oral hygiene : prophylaxis and pyorrhea alveolaris.

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Practical oral hygiene : prophylaxis and pyorrhea alveolaris. Public Domain Mark. Source: Wellcome Collection.

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This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.