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Letterbook of Peter Dewitt, Philadelphia merchant, reflects his trade in lumber and other commodities, 1794-1813, continued as accounts current of an unidentified Philadelphia shipping line, 1818-1833, and domestic memoranda.

This notebook contains the observations of a mid-18th century New York apprentice. It is a record of clinical cases, in which Renaudet describes the patients' ailments, treatments prescribed and the result of those treatments. Common ailments include…