Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, pages 544-551

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, pages 86-96

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, pages 390-394

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, pages 80-84

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, pages 362-383

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, issue 3, pages 59-65

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, issue 6, pages 142-147

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, issue 9, pages 213-217

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, pages 215-217

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, issue 16, pages 423-431

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, pages 327-335

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, issue 20, pages 509-520

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, issue 8, pages 194-197

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, issue 20, pages 520-528.

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, issue 4, pages 77-79

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, issue 10, pages 245-254

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, issue 12, pages 309-317

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, issue 7, pages 159-171

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, issue 15, pages 394-398

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, issue 13, pages 335-343

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, pages 175-176

Published in Jour Wash Acad Sci, in 1927, in volume 17, pages 453-454

Published in Jour Washington Acad Sci, in 1927, in volume 17, pages 84-86

Published in Jour Washington Acad Sci, in 1927, in volume 17, pages 198-199

Published in Jour Washington Acad Sci, in 1927, in volume 17, pages 230-231

Published in Jour Washington Acad Sci, in 1927, in volume 17, pages 317-319

Published in Jour Washington Acad Sci, in 1927, in volume 17, pages 417-423

Published in Jour Washington Acad Sci, in 1927, in volume 17, pages 464-475

Published in Jour Washington Acad Sci, in 1927, in volume 17, pages 476-478

Published in Jour Washington Acad Sci, in 1927, in volume 17, pages 505-509

Published in Journal of The Washington Academy of Sciences, in 1927, in volume 17, pages 150-155