The Ginn basic readers by David H. Russell and others. Illustrated by Ruth Steed and Catherine Scholz. By Odille Ousley. Sections are We Play Cowboy, Good Surprises, Fun on the Farm; Big Books, Little Books, Good Books; Fun at Blue Lake. Beautiful vintage illustration. Looks like 1st or 2nd grade reader.
I was worried this book would be super sexist or racist, but it's actually really cute. A few things I'll talk to my kids about: there are only white characters, the lack of logjam jets when on a boat, and the old woman who buys a puppy from a pet store. Overall a great early reading book, very similar in text style to Little Bear.