Value of The World's History Illuminated

You will need to tell is the year they were published. Believe it or not this really matters so much. If they were published in 1918 or before then they are worth something and you should see a book dealer on this. If they were published after 1918 then they are just considered old and not worth more than a few dollars tops.

If they are complete and 100 years old or more, they are worth something. Take them to a book dealer and get an appraisal