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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Verso: Unknown Woman (CDV) - Johnson-Wade Album
Backmark: C.A. WINSOR, / PORTRAIT / Photographer, / 12 & 14 E. Main Street, / GALESBURG, ILLINOIS 4 x 2 3/8 inches CDV from the Johnson-Wade Album.
