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Filtering by: Resource type moving image Remove constraint Resource type: moving image Subject scientific expeditions Remove constraint Subject: scientific expeditions Subject equipment and supplies Remove constraint Subject: equipment and supplies Time Period (Topic) 1930s (1930-1939) Remove constraint Time Period (Topic): 1930s (1930-1939) Time Period (Topic) 1920s (1920-1929) Remove constraint Time Period (Topic): 1920s (1920-1929)

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