The rights are now with Alliance Atlantis in Canada.

The number to call is 1-800-518-6006 (not sure if this will work outside of
Canada). Otherwise call 1-416-967-1174

Don't be surprised if they don't have a clue what you're talking about. You
will likely have to be persistent to get any results. They probably have no
idea they even own the title. Assure them that they do. Give the title, the
year (1957) and the format (documentary). Beat them over the head if you
have to.

dw

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Online resources for film/TV studies may be found at ScreenSite
http://www.tcf.ua.edu/ScreenSite