Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 1-9

Published in Journal of the Washington Academy of Sciences, in 1932, in volume 22, pages 9-19

Published in Journal of the Washington Academy of Sciences, in 1932, in volume 22, pages 19

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 25-37.

Published in Jour Washington Acad Sci, in 1932, in volume 22, pages 65-69

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 69-70

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 137-148

Published in Jour Washington Acad Sci, in 1932, in volume 22, pages 181-182

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 182-184

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 184-187

Published in Jour Washington Acad Sci, in 1932, in volume 22, pages 239-242

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 243-245

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 246-257

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 257-260

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 271-274

Published in Jour Washington Acad Sci, in 1932, in volume 22, pages 274-275

Published in Jour Washington Acad Sci, in 1932, in volume 22, pages 312-313

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 329-333

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 333-335

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 335-344

Published in Jour Washington Acad Sci, in 1932, in volume 22, pages 344-354

Published in Jour Washington Acad Sci, in 1932, in volume 22, pages 386-388

Published in Jour Washington Acad Sci, in 1932, in volume 22, pages 411-413

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 506-510

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 510-514

Published in Jour Washington Acad Sci, in 1932, in volume 22, pages 514-517

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, pages 517-518

Published in Journal of the Washington Academy of Sciences, in 1932, in volume 22, issue 4, pages 88-92

Published in Journal of The Washington Academy of Sciences, in 1932, in volume 22, issue 6, pages 125-137