Filtering by: File Format video/x-msvideo Remove constraint File Format: video/x-msvideo Resource Type moving image Remove constraint Resource Type: moving image Subject explorers Remove constraint Subject: explorers 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)