Many old children's books are actually in the public domain. Yes it's true books like the Wizard of Oz, the Three Little Pigs and many fairy tale books are public domain which means that you can use the text and the images from these books for any art project (including commercial projects like print on demand, Redbubble, Teepublic, publishing an ebook, creating highend art prints, etc).

I include a quick walkthrough on how you can find public domain properties that come into copyrightfree status on January 1st of each year as well.

Timestamps:
00:00 Introduction
00:42 Children's Books Overview
03:35 Wizard of Oz
05:50 Public Domain
08:40 Baseball ABC

Links:
https://www.loc.gov/freetouse/
https://www.loc.gov/freetouse/class...