Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 1-2

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 2-18

Published in Jour Washington Acad Sci, in 1947, in volume 37, pages 19-22

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 22-24

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 64-72

Published in Jour Washington Acad Sci, in 1947, in volume 37, pages 89-91

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 92-95

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 95-102

Published in Jour Washington Acad Sci, in 1947, in volume 37, pages 104-105

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 109-111

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 111-13

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 113-134

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 134-139

Published in Jour Washington Acad Sci, in 1947, in volume 37, pages 160-169

Published in Jour Washington Acad Sci, in 1947, in volume 37, pages 170-178

Published in Journal. Washington Academy of Sciences, Washington, D. C, in 1947, in volume 37, pages 210-7

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 242-243

Published in Jour Washington Acad Sci, in 1947, in volume 37, pages 263-275

Published in Jour Washington A Cad Sci, in 1947, in volume 37, pages 275-284

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 284-288

Published in Jour Washington Acad Sci, in 1947, in volume 37, pages 293-296

Published in Jour Washington Acad Sci, in 1947, in volume 37, pages 306-309

Published in Jour Washington Acad Sci, in 1947, in volume 37, pages 310-315

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 315-325

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 325-328

Published in Jour Washington Acad Sci, in 1947, in volume 37, pages 354-366

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 366-368

Published in Jour Washington Acad Sci, in 1947, in volume 37, pages 397-407

Published in Jour Washington Acad Sci, in 1947, in volume 37, pages 427-430

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, pages 430-435

Published in Jour Washington Acad Sci, in 1947, in volume 37, issue 4, pages 140-141

Published in Journal of the Washington Academy of Sciences, in 1947, in volume 37, issue 7, pages 243-254

Published in Journal of The Washington Academy of Sciences, in 1947, in volume 37, issue 10, pages 353-354