Ca. 1856 Davis’ Building, Main Street, Plymouth, Massachusetts.
S. N. Dunham was recorded from a 9th plate advertising card for Steven Lucas in Chris Steele’s Collection. 25 Cents. S. Lucas & Co., Daguerreotype, Ambrotype, Stereoscope and Photograph Artists. Rooms in Davis’ Building, Main Street, Plymouth. S. Lucas, S. N. Dunham.
S. N. Duncan is not recorded in A Directory of Massachusetts Photographers, 1839-1900 or other photographic directories. Steven Lucas is recorded in other photographic directories.
1856 168 South Second Street, Philadelphia, Pennsylvania.
Lybrand Clayton was recorded in the Photographic and fine Arts Journal (New York, New York) on April 1, 1856. In an article entitled the Photographic Galleries of America. Number Two, Philadelphia. The author visited 57 Galleries in Philadelphia.
Clayton. — These specimens show a gradation from indifferent to very good, proving the artist capable of producing fair pictures. This artist has several stereoscopes in front of the door, which I noticed was the case with several establishments. This is undoubtedly probono publico.
Listed as a daguerreotypist in Craig’s Daguerreian Registry, also recorded in Directory Of Pennsylvania Photographers 1839-1900.
 Not all first names or complete addresses were recorded in article. Craig’s Daguerreian Registry was used to assist in identification when possible first name and address were added.
1859 Address Unknown, Washington, District of Columbia.
Bryant and Smith was recorded in the Evening Star (Washington, D. C.) on June 14, 1859. From The photographers & publishers, Messrs. Bryant & Smith, we have six photographic (stereoscopic) views of scenes in and about Washington, which, for excellence of execution, are quite equal to the best French stereoscopic views. They consist of representations of the Patent Office, Washington Monument, Jackson Statute, White House, Capitol extension, (east front,) and the tomb of Washington. They are for sale by Franklin Philp.
Bryant & Smith are not recorded in in other photographic directories that I have access to. They were not listed in the 1860 Washington, D. C. Directory. Three stereoviews by them can be found at the New York Public Library digital collection they are Jackson Monument, National Observatory and two views of Tomb of Washington. They are tan mounts with domed images.