This is the way Dumbo was originally supposed to be published, in roll-a-book form. Unfortunately no one has any copies of this anymore, I guess there is the question of whether it even actually ever existed. Although one man who works for Disney recalls reading it that way, so I'm guessing at least a couple copies were around in 1939.

Sources (In case you want to jump down the rabbit hole!)
📰 The Creation of Dumbo and His Syracuse Connection - Richard G. Case
www.cnyhistory.org/2014/10/dumbo/

📰 The Original ‘Dumbo’ Story Would Have Had More Twists and Turns - David Kindy
www.smithsonianmag.com/innovation/in-its-intended-…

📜 Patent
www.freepatentsonline.com/2163523.pdf

The Mysterious Dumbo Roll-a-Book - Michael Barrier
www.michaelbarrier.com/Essays/DumboRollABook/Dumbo…

📰Helen Durney Papers at Syracuse University (Digital Collection)
digitalcollections.syr.edu/Documents/Detail/dumbo-…

📰The Original Dumbo - Jim Korkis
mouseplanet.com/the-original-dumbo/6871/

📰Dumbo, the Flying Elephant (partially found Roll-a-book precursor book to Disney animated film; 1939)
lostmediawiki.com/Dumbo,_the_Flying_Elephant_(part…