This biographical dictionary of some 3,000 photographers (and workers in related trades), active in a vast area of North America before 1866, is based on extensive research and enhanced by some 240 illustrations, most of which are published here for the first time.

In addition to photographers, the book includes photographic printers, retouchers, and colorists, and manufacturers and sellers of photographic apparatus and stock. Because creators of moving panoramas and optical amusements such as dioramas and magic lantern performances often fashioned their works after photographs, the people behind those exhibitions are also discussed.