Tourism is big business in South Dakota and it has been for a long time.
A promotional film produced by the Chicago Northwestern Railroad shows people enjoying various recreational activities in the Black Hills in 1938. The film would have likely been shown in movie theaters before the featured film.
Below: A few still images from the film
A school-ready video clip and teacher's guide are available in SDPB's Digital Learning Library.
More information about Spearfish Canyon: