found: Photographic mosaics, an annual record of photographic progress, 1889:p. xxD (Moss Engraving Co., 535 Pearl Street, New York)
found: Photography in America: the formative years, 1839-1900, 1978:p. 266 (Moss Engraving Company, founded 1880 by John Calvin and Mary Moss)
found: George Eastman House database, Aug. 19, 2002(Moss Engraving Co., active 1880-1889, 535 Pearl St., New York, invented Mosstypes)
found: LC database, Aug. 19, 2002(usage: Moss Engraving Company; Moss Engraving Co.)
found: MWA/NAIP files, Nov. 1, 2006(hdg.: Moss Engraving Company; note: firm est. in New York in 1880 by John Calvin Moss and Mary Moss following closure of Photo Engraving Co.)