1856 312 Market Street, Philadelphia, Pennsylvania.
Mahan & Good (Thomas J. Mahan & Jonathan J. Good) were 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. Mahan & Good. — Pretty fair pictures, some excellent oil colored daguerreotypes. The pictures however are no wise remarkable for beauty.
Mahan & Good are recorded in other photographic directories, but are included here because of the first-hand account of their work.
 Not all first names or complete addresses were recorded in article Directory of Pennsylvania Photographers, 1839-1900 (Linda A. Ries & Jay W. Ruby) was used to assist in identification when possible first name and address were added.