1975 edition, ftw! :) As a kid I read the set my parents bought cover to cover until I went to highschool. I had an opportunity to buy a very old set of these

1975 edition, ftw! :) As a kid I read the set my parents bought cover to cover until I went to highschool. I had an opportunity to buy a very old set of these at a book store that was going out of business and having like a 95% off sale, and by the time I decided to turn around and go back to buy them, they were gone. :( I love reading old encyclopedias.