nemfrog:

The teeth. Health knowledge. a thorough and concise knowledge of the prevention, causes, and treatments of disease, simplified for home use. 1920.

source http://kianorshahmohammadi.com/post/152902172945

From http://dentaleconomicsus.blogspot.com/2016/11/nemfrog-teethhealth-knowledgea-thorough.html

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