Price List of Photographic Card Stock, A. M. Collins Mfg. Co. (Philadelphia, PA), dated 1903, ~6"x9¼", 56pp
A. M. Collins printed this large 1903 catalog for professionals and a smaller 1903-1904 catalog of cards for the amateur. This one also had an insert (scanned after the catalog). Catalogs such as these should provide a means for dating period photographs.