Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, pages 18-28

Published in Jour Washington Acad Sci, in 1926, in volume 16, pages 35-41

Published in Jour Washington Acad Sci, in 1926, in volume 16, pages 53-67

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, pages 132-138

Published in Jour Washington Acad Sci, in 1926, in volume 16, pages 175-177

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, pages 190-193

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, pages 324-332

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, pages 445-446

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, pages 446-447

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, pages 448-455

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, pages 515-522

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, pages 565-573

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, issue 2, pages 545-552

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, issue 6, pages 160-161

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, issue 8, pages 204-207

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, issue 8, pages 207-214

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, issue 8, pages 215-227

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, issue 12, pages 333-339

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, issue 13, pages 361-365

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, issue 13, pages 365-369

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, issue 15, pages 413-418

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, issue 15, pages 418-422

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, issue 15, pages 422-428

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, issue 18, pages 481-484

Published in Journal of The Washington Academy of Sciences, in 1926, in volume 16, issue 18, pages 483-492