Published in Smithsonian miscellaneous collections, in 1907, in volume 48, pages 59-68

Published in Smithsonian miscellaneous collections, in 1907, in volume 48, issue 12, pages 149-172

Published in Smithsonian miscellaneous collections, in 1907, in volume 48, issue 14, pages 187-194

Published in Smithsonian Miscellaneous Collections, in 1907, in volume 50, pages 139-173