We do not specialize in books that were printed before 1970, nor books that do not have an ISBN assigned - we are not familiar with these types of books, so could not offer any input on the value. 
Your best bet would be to find a bookseller that specializes in rare and antique books - you may be able to find a local one by searching here: 
THE ANTIQUARIAN BOOKSELLERS' ASSOCIATION OF AMERICA

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