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"(...) In 1941, he [Romuald Gantkowski] completed the documentary film The Land of My Mother, narrated by Eve Curie, which used footage from the 1938 color film Beautiful Poland. This film was created for the 1939 New York World's Fair, and for many years was considered a lost film":
https://www.youtube.com/watch?v=WJwUpSSYOPQ
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