In 1923, Falls teamed up with Doubleday editor May Massee to create The ABC Book. Falls wrote and illustrated the wood block book. It features wood block cuts of various animals that are used to help represent certain letters of the alphabet and utilizes blue, green, orange, and yellow backgrounds to enhance the black-inked woodcuts. Falls' wood block design is believed to have been inspired by English author William Nicholson's The Square Book of Animals. Falls received good reviews for The ABC Book, which was used to show that American authors were able to create work on the same level as their English peers.