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"Margaret Conneely's film So Long Ago (c. 1950s) intercuts footage of children reading about dinosaurs with special-effects shots of dinosaurs, borrowed from a commercial film (perhaps The Lost World, 1925)" (Tepperman 335).
Tepperman, Charles. Amateur Cinema: The Rise of North American Moviemaking, 1923-1960. University of California Press, 2014.
Chicago Film Archives
Margaret Conneely Collection, 1902-2007, Chicago Film Archives