The Snow White "Big Little Book", Whitman No. 1460
Before the general theatrical release of Snow White and the Seven Dwarfs, its story line was adapted by Merrill de Maris and drawn by Hank Porter for the 1937/38 Sunday newspaper comic strip. This would be reproduced as a comic book many times over starting in 1944.
Yet, the first bound publication was actually the 1938 Big Little Book (no. 1460) by Whitman Publishers. Copyright Walt Disney Enterprises, 288 pages. Measures 3.625" x 4.5" x 1.5".