Your best source of information on early silent animation
is Donald Crafton at the Wisconsin Center for Film/Theater
Research, 6040 Vilas Hall, 821 University Ave., Madison,
WI 53706, phone: (608) 262-9706. His book may be helpful:
Before Mickey, Cambridge, MA: MIT Press, 1982.
Some films I know of are:
WinsorM McCay's "Little Nemo"--stereotyped African savage
Fleischer Bros.'s "The Chinaman"-_in the Out of the Inkwell series
Also try the Colonel Heeza Liar series, whose jungle explorer
met several stereotyped tribespeople.
For secondary resources, try:
Barcus, F. Earle. Images of Life on Children's Television.
New York: Praeger, 1982.
Berger, Jan et al. Coalition Against Racism and Sexism. "Letter
to the Editor" The Soho Weekly, Sept. 4, 1975.
Lawling, John. (Regent University) "Hollywood Shuffle: Images of
African-Americans in the Animated Film," Paper presented at the
Society for Animation Studies conference, Ottawa, Oct. 1990.
Shale, Richard. Donald Duck Joins Up. Ann Arbor: UMI Research Press, 1982.
Shull, Michael & Witt, David. Doing Their Bit: Wartime American
Animated Short Films. McFarland & Co., 1987.
Good luck. Bill Mikulak, University of Pennsylvania