Published in Journal of The Washington Academy of Sciences, in 1936, in volume 25, issue 7, pages 311-325

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 6-16

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 16-23

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 31-32

Published in Jour Washington Acad Sci, in 1936, in volume 26, pages 32-34

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 34-40

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 41-45

Published in Jour Washington Acad Sci, in 1936, in volume 26, pages 52-59

Published in Jour Washington Acad Sci, in 1936, in volume 26, pages 60-64

Published in Jour Washington Acad Sci, in 1936, in volume 26, pages 64-66

Published in Jour Washington Acad Sci, in 1936, in volume 26, pages 66-70

Published in Jour Washington Acad Sci, in 1936, in volume 26, pages 70-83

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 111-120

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 128-133

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 162-165

Published in Jour Washington Acad Sci, in 1936, in volume 26, pages 165-177

Published in Jour Washington Acad Sci, in 1936, in volume 26, pages 181-182

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 199-207

Published in Jour Washington Acad Sci, in 1936, in volume 26, pages 294-296

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 296-298

Published in Journal of the Washington Academy of Sciences, in 1936, in volume 26, pages 298-303

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 324-331

Published in Jour Washington Acad Sci, in 1936, in volume 26, pages 331-346

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 358-61

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 361-365

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 365-376

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 376-382

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 404-409

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 410-414

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 414-419

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 420-423

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 423-430

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 430-434

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 462-464

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 464-466

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 528-530

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 535-8

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 538-543

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, pages 543-545

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, issue 1, pages 24-31

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, issue 4, pages 156-162

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, issue 4, pages 177-179

Published in Journal of the Washington Academy of Sciences, in 1936, in volume 26, issue 5, pages 213-222

Published in Journal of The Washington Academy of Sciences, in 1936, in volume 26, issue 11, pages 452-460