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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"Nettie" (verso) - Black Album
black albumalbumtintype0649backmarkA.P. HartA.P. Hart'sSun Beam GalleryElmiraNY
![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)
