Backmarks
You will often find photographer advertisements on the backs of images. From simple to elaborate they can be extremely helpful when it comes to researching an image.
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Two Unknown Girls (CDV) - Phelps Album
Backmark: W.L. Edwards, Photographer, Rooms over Willie & Kauffman's Tin Shop, Ashland, Ohio. Page 36 of the Phelps Album. 4 x 2 1/2 inches
![Joseph Hartman [and wife] - Backmark (CDV) - Phelps Album](https://photos.smugmug.com/Special-Interest/Backmarks/i-8djjMbN/1/d6c975b5/Ti/3514142820_c2d0d4d9a4_o-Ti.jpg)
