Filtering by: Sub collection sim series 5: films/sound recordings Remove constraint Sub collection sim: series 5: films/sound recordings Subject antarctica--aerial exploration Remove constraint Subject: antarctica--aerial exploration Subject hearst, william randolph, 1908 Remove constraint Subject: hearst, william randolph, 1908 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)