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Filtering by: Format video/mp4 Remove constraint Format: video/mp4 Resource type moving image Remove constraint Resource type: moving image Subject antarctica--aerial exploration Remove constraint Subject: antarctica--aerial exploration Subject airplanes Remove constraint Subject: airplanes Subject wilkins, george h. (george hubert), sir, 1888-1958 Remove constraint Subject: wilkins, george h. (george hubert), sir, 1888-1958 Time Period (Topic) 1920s (1920-1929) Remove constraint Time Period (Topic): 1920s (1920-1929)

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