The influence of metallic tractors on the human body, in removing various painful inflammatory diseases, such as rheumatism, pleurisy, some gouty affections, &c. &c : lately discovered by Dr. Perkins, of North America ... / by Benjamin Douglas Perkins, son to the discoverer.

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The influence of metallic tractors on the human body, in removing various painful inflammatory diseases, such as rheumatism, pleurisy, some gouty affections, &c. &c : lately discovered by Dr. Perkins, of North America ... / by Benjamin Douglas Perkins, son to the discoverer. Public Domain Mark. Source: Wellcome Collection.

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