Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 4-8

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 12-14

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 14-16

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 17-20

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 20-21

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 22-24

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 24-26

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 30-34

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 35-39

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 40-43

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 44-45

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 46-47

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 64-66

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 75-77

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 78-83

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 83-84

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 91-102

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 107-110

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 110-113

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 113-115

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 140-142

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 142-146

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 146-147

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 159-167

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 168-179

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 179-180

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 191-194

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 195-196

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 206-209

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 209-212

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 235-237

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 260-263

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 270-272

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 272-276

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 285-290

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 291-294

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 295-296

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 300-302

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 302-307

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 319-323

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 324-328

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 328-331

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 331-333

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 333-334

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 335-338

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 338-340

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 344-347

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 347-356

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 357-360

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 361-364

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 364-367

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 367-70

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 370-372

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 383-392

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 393-395

Published in Journal of The Washington Academy of Sciences, in 1951, in volume 41, pages 395-399

Published in Jour Washington Acad Sci, in 1951, in volume 41, pages 399-400