I don't actually remember any early childhood books from my childhood. Maybe because I started reading chapter books so early? I loved The Bobsey Twins and Nancy Drew was my absolute favorite. I remember we used to go to the library in Mangum during the summer and I'd check out books and bring them home and read them all that day. My mom would get so annoyed and remind me that we weren't going back for 2 weeks. I'd just say "It's okay, I can read them again".
I remember my second grade teacher Mrs. Denney reading a chapter book to us about a dinosaur; seems like the dinosaur's name was Denny? I'll have to ask her what the book was because now it's bugging me that I can't remember lol.
From my own children (and child care); I remember enjoying Green Eggs and Ham and The Foot Book by Dr. Seuss, Are you my Mother by P.D. Eastman, Berenstein Bears books, and Love you Forever by Robert Munsch.