Published in Journal of the Washington Academy of Sciences, in 1933, in volume 23, pages 525-526

Published in Journal of the Washington Academy of Sciences, in 1933, in volume 23, pages 523-525

Published in Journal of the Washington Academy of Sciences, in 1933, in volume 23, issue 4, pages 212-216

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, pages 211-212

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, pages 30-34

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, pages 144-147

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, pages 391-396

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, pages 25-30

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, issue 1, pages 61-63

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 36-46

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 46-58

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 95-100

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 100-109

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 134-136

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 137-138

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 141-144

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 147-148

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 198-200

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 352-355

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 389-391

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 429-435

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 449-456

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 456-460

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 460-473

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 473-478

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 493-496

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 544-557

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 560-563

Published in Jour Washington Acad Sci, in 1933, in volume 23, pages 563-566

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, pages 34-36

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, pages 138-141

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, pages 200-202

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, pages 203-208

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, pages 355-357

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, pages 358

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, pages 426-429

Published in Journal of The Washington Academy of Sciences, in 1933, in volume 23, pages 558-60

Published in Journal of the Washington Academy of Sciences, in 1933, in volume 23, issue 7, pages 360