Take it to a conservationist. It it smells moldy or has "foxing" which are mold marks it needs work to preserve it to keep it from getting worse. Since it is dated and has words on the back, these could be clues to the press where it was printed.You could get some information on google. I actually learned the value of an old book of mine this way.
Source(s):
I studied lithography under a master printmaker who studied under Jocob Kainen who was a print conservationist at the Smithsonian Institution.


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