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, pages 30-34

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

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

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

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

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 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 211-212

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

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

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 426-429

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 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, pages 525-526

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

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

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, issue 1, pages 61-63

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, issue 7, pages 360