Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 1-20

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 21-27

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 28-32

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 33-37

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 46-65

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 66-81

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 85-92

Published in Journal of the Washington Academy of Sciences, in 1941, in volume 31, pages 93-96

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 105-107

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 107-109

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 115-117

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 117-124

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 129-135

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 135-140

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 141-145

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 173-179

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 181-187

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 196-203

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 203-210

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 259-260

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 261-263

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 263-269

Published in Journal of the Washington Academy of Sciences, in 1941, in volume 31, pages 269-272

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 285-288

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 289-295

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 296-308

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 311-315

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 348-355

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 356-368

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 384-388

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 388-398

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 399-403

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 404-409

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 409-415

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 432-440

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 466-481

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 481-483

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 501-503

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 504-506

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 506-508

Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 509-515

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, issue 3, pages 96-105

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, issue 5, pages 188-195

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 32, pages 153-150

Published in Journal of The Washington Academy of Sciences, in 1941, in volume 32, issue 6, pages 184-187