My folks had the World Book as well and many year books. They also had a Childcraft set. This is a 1964 set and might be exactly what we had.
It had a craft book that was "Make and Do", a poem book, a story book, "Holidays and Customs", "World and Space", "How Things Work", "How We Get Things", etc.
I would often just open a volume of the World Book and start reading things at random.
When young I read Just about every Dr. Seuss I could find. We had a lot and I got the rest at the library.
Later I read Encylopedia Brown, Hardy Boys, Nancy Drew, etc.
When still a little older I read every single Louis L'Amour book and then The Hobbit/The Lord of the Rings, Tom Sawyer and Huck Finn.
In high school I tried to read as many classics as I could like Gone With the Wind, a bunch of Dickens, Les Miserables, a bunch of Asimov, etc.