What is the first movie from Disney not based on an existing book

Is it true that all Disney movies have been inspired from novels uploaded on public domains? - Quora

Doug's 1st Movie used book by Nancy Krulik: 9780786843497

Why does Disney keep ruining original classics by changing original characters? - Quora

10 Disney Movies That Aren't Based On A Existing Story

What is the first movie from Disney not based on an existing book nor a story? - Quora

22 Disney Movies You Didn't Know Were Based on Books - Film 14

Where Did Walt Disney Get His Ideas? - DiscoverBooks.com

What are some mistakes made by Disney when depicting historical periods in their films? - Quora

Why does Disney keep ruining original classics by changing original characters? - Quora

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Enchanted (film) - Wikipedia

Why does Disney make movies based on books? - Quora