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 wilkins, george h. (george hubert), sir, 1888-1958 Remove constraint Subject: wilkins, george h. (george hubert), sir, 1888-1958 Subject equipment and supplies Remove constraint Subject: equipment and supplies Time Period (Topic) 1930s (1930-1939) Remove constraint Time Period (Topic): 1930s (1930-1939)