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The basis of this work is a 'Genealogy of John Thomson' by Ignatius Thomson, published in 1841.
"In various sections photographers and photomechanical exhibitions are listed. Among the exhibitors of note are Heliotype Printing Co., E. Bierstadt, Rockwood. The Graphic Co., and the Leggo Brothers. [This is] an important list of the various firms displaying at the Centennial. The firms are the first serious photomechanical printers in this country." -- Hanson Collection Catalog, p. 55.