Published in Smithsonian Miscellaneous Collections, in 1939, in volume 98, pages 1-7

Published in Smithsonian Miscellaneous Collections, in 1939, in volume 98, issue 4, pages 1-7

Published in Smithsonian Miscellaneous Collections, in 1939, in volume 98, issue 10, pages 1-18

Published in Smithsonian Miscellaneous Collections, in 1939, in volume 98, issue 12, pages 1-7