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The Big Challenge is a 27-minute documentary produced in 1966 about the construction of Kennedy Space Center. Presented by NASA and the U.S. Army Corps of Engineers, it was produced by the Technicolor Corporation of America.
I just uploaded a copy of this documentary to YouTube. The quality isn't very good, but you get what you pay for.
I've seen a color version in much better condition, but the owner wants serious dollars for a copy so the above is the best available for now.