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The illustration of Whipple's steam engine is taken from this advertisment by Whipple which appears (on the same page as an advertisement for the gallery of Southworth and Hawes of Boston) in:
Adams, George.
The Boston Directory: Containing the City Record, a General Directory of the Citizens, and a Special Directory of Trades, Professions, &c. 1848—9.
(Boston: James French, 1848) pg. 11

(Collection of Gary W. Ewer)

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