Thank you for the images and for your patience.
To start and to clarify, these are not lithographs. Lithographs are generally mass produced, usually, but not always in color and machine produced. What you are have are original etched prints. They were produced in a studio, by hand and not a machine. One can discern an original etching by the platemark in that paper. A platemark is the indentation in the paper surrounding the printed image. An etching is first executed by 'carving' the picture with a metal stylus into a metal plate. Then the plate is inked and pressed into the paper which transfers the ink and causes the indent or platemark.
Your prints date to likely around 1905 - 1915 and not later than 1930.
There are various reasons for numerals on the sheet; they could be potential page numbers for a planned book publication or catalogue entry numbers from a dealer or collector. The handwritten numbers do not have impact on the value of the prints themselves.
Unfortunately, which is commonly the case, your etchings are illegibly signed. This is typical in the print market and valuations are based on comparables.
On today's market, a framed 6x9" image can sell for $30 - $70 per image.
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