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Sources Consulted for Factual Information about
Three Guesses
"IMDb: Three Guesses" Internet Movie Database, Inc.
https://www.imdb.com/title/tt0224253/reference
.
National Film Board of Canada. "NFB -- Three Guesses" National Film Board of Canada.
http://onf-nfb.gc.ca/en/our-collection/?idfilm=10869
.