(left to right): Hellmut de Terra (1900-1981) and Frank Thone (1891-1949), , Smithsonian Institution Archives, In 1939, archeologist Hellmut de Terra (1900-1981) was affiliated with the Carnegie Institution; Frank Thone (1891-1949) was Senior Biology Editor at Science Service. Caption to photograph reads: "Dr. Hellmut de Terra (left) with Paleolithic chopper from Pleistocene of Upper Burma (1938) Carnegie Institute of Washington exhibition.".