Published in Journal of the Washington Academy of Sciences, in 1923, in volume 13, pages 184-185

Published in Journal of the Washington Academy of Sciences, in 1923, in volume 13, pages 146-149

Published in Journal of the Washington Academy of Sciences, in 1923, in volume 13, pages 185-186

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, issue 8, pages 143-149

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, issue 6, pages 102-105

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, issue 9, pages 167-179

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, issue 9, pages 179-184

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 223-225

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, issue 17, pages 384-392

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, issue 19, pages 428-443

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, issue 16, pages 363-369

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, issue 20, pages 436-443

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, issue 15, pages 350-354

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 259-260

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 260-261

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 261-262

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 262-263

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 129-138

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 254-257

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 282-287

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 383-384

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 225-226

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 226-232

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 347-350

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 8-12

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 107-109

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 369-371

Published in Journal of The Washington Academy of Sciences, in 1923, in volume 13, pages 408-411