I have a 10 volume hardback set of Popular Science, copyright 1977, Grolier. How can I find out what they are worth?
By svvvv5
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Like general encyclopedia, I would bet that they are not worth anything. You could try a second hand bookstore, or offer them on Kijiiji or Freecycle. You might find someone who wants them for a novelty read. Don't get your hopes up.
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