| Martin M. Lawrence M.M. Lawrence's Daguerrean Gallery 1845 Advert Google Books LL/35325 Sheldon & Co.'s Business or Advertising Directory: Containing the Cards, Circulars, and Advertisements of the Principal Firms of the Cities of New-York, Boston, Philadelphia, Baltimore, &c., &c. (New York: John F. Trow & Company, 1845), p.42.
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