The 1978 edition of the World Book Encyclopedia. My parents bought it as a Christmas 1977 present . Each time a new volume came (once a month one letter at a time) I read it cover to cover. I have since read each one beginning to end at least 6 times. Even now every once in a while I will just pick one up and read it.
I still have the whole set including the "Science Year" and "Year Book" volumes for '79 and when ever my oldest has a question about something we break out the world book..
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