Bobby and John Maslen developed the Bob Books, while Bobby was a teacher of 3 to 5-year-olds at a private school in Portland, Oregon. After many years of self-publishing, Scholastic became Bob Books’ publisher in 1995.
The first BOB Book I've encountered, this one was almost at a level which my four-year-old could read independently. The hardest word was "polliwogs," but who's surprised by that?