Published in Journal of The Washington Academy of Sciences, in 1950, in volume 39, pages 389-398

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 39, pages 398-409

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 39, pages 409-416

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 5-19

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 21-22

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 22-28

Published in Journal of the Washington Academy of Sciences, in 1950, in volume 40, pages 50-55

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 56-59

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 59-61

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 75-79

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 79-82

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 82-87

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 87-92

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 92-93

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 126-129

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 129-133

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 133-136

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 157-161

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 161-163

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 164-166

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 166-169

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 177-183

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 194-198

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 207-08

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 217-225

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 225-228

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 229-236

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 238-239

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 245-247

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 248-260

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 260-265

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 266-268

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 269-272

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 273-277

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 277-282

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 285-289

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 289-291

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 291-295

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 295-298

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 298-299

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 299-300

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 301-302

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 317-321

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 355-361

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 361-371

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 371-378

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 378-381

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 381-384

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 397-404

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 405-409

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 413-415

Published in Jour Washington Acad Sci, in 1950, in volume 40, pages 415-417

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, pages 418-419

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, issue 1, pages 19-21

Published in Journal of The Washington Academy of Sciences, in 1950, in volume 40, issue 9, pages 282-285