Published in Journal of the Washington Academy of Sciences, in 1948, in volume 38, pages 14-21

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, pages 75-78

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 106-108

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 130-132

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 137-142

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, pages 143-144

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 173-176

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, pages 176-183

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 183-184

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 184-185

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, pages 185-188

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 201-206

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 206-213

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 236-238

Published in Journal of the Washington Academy of Sciences, in 1948, in volume 38, pages 238-240

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, pages 243-245

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, pages 248-251

Published in Journal. Washington Academy of Sciences, Washington, D. C, in 1948, in volume 38, pages 269-74

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, pages 274-279

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 279-281

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 306-309

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 310-312

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 312-315

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, pages 315-316

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 316-318

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 336-340

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, pages 340-345

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, pages 346-350

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, pages 350-352

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, pages 365-382

Published in Jour Washington Acad Sci, in 1948, in volume 38, pages 416-419

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, pages 419-420

Published in Journal of The Washington Academy of Sciences, in 1948, in volume 38, issue 3, pages 87-105