On February 4, 1938, Disney's Snow White and the Seven Dwarfs was released in the United States as the first full length feature film to use cel-animation.
T. Berg, S. Ellison, J. Prochaska, K. Venn, and M. Dessauges-Zavadsky. (2015)cite arxiv:1507.08311Comment: Accepted for publication in MNRAS. 24 Pages, 10 Figures, 4 tables. Data compilations within tarball or available upon request (contact Trystyn Berg).