Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 1-5

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 5-10

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 10-12

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 12-22

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 23-36

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 36-38

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 56-57

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 58-64

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 65-79

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 79-81

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 81-83

Published in Jour Washington Acad Sci, in 1937, in volume 27, pages 105-111

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 114-130

Published in Jour Washington Acad Sci, in 1937, in volume 27, pages 143-146

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 146-164

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 165-176

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 203-209

Published in Jour Washington Acad Sci, in 1937, in volume 27, pages 209-213

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 255-261

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 312-316

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 329-343

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 354-357

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 373-374

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 402-404

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 412-414

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 418-423

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 423-431

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 431-438

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 438-444

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 444-448

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 449-451

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 452-458

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 461-474

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 474-479

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 479-482

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 495-501

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 517-531

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, pages 531-535

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, issue 7, pages 304-312

Published in Journal of The Washington Academy of Sciences, in 1937, in volume 27, issue 9, pages 374-391