My father-in-law picked this up for me a while back at a library book sale. The inside cover shows it’s from 1966, published by Scholastic Book Services, and references "Sidesplitters from Bil Keane’s Sideshow."
Of course Keane is well known as the creator of Family Circus, but I’ve never heard of Sideshow. Anyone know anything about it?
In any case, I’ve got the whole wonderful book scanned in over at Flickr. Here’s some samples! Enjoy: