Published in Journal of the Washington Academy of Sciences, in 1922, in volume 11, pages 504-509

Published in Journal of The Washington Academy of Sciences, in 1922, in volume 12, pages 8-19

Published in Journal of The Washington Academy of Sciences, in 1922, in volume 12, pages 262-264

Published in Journal of The Washington Academy of Sciences, in 1922, in volume 12, pages 299-303

Published in Journal of The Washington Academy of Sciences, in 1922, in volume 12, pages 353-358

Published in Journal of The Washington Academy of Sciences, in 1922, in volume 12, issue 3, pages 54-64

Published in Journal of The Washington Academy of Sciences, in 1922, in volume 12, issue 8, pages 200-205

Published in Journal of The Washington Academy of Sciences, in 1922, in volume 12, issue 8, pages 205-208

Published in Journal of The Washington Academy of Sciences, in 1922, in volume 12, issue 11, pages 255-262

Published in Journal of The Washington Academy of Sciences, in 1922, in volume 12, issue 14, pages 330-332

Published in Journal of The Washington Academy of Sciences, in 1922, in volume 12, issue 17, pages 391-399

Published in Journal of The Washington Academy of Sciences, in 1922, in volume 12, issue 17, pages 399-400

Published in Journal of The Washington Academy of Sciences, in 1922, in volume 12, issue 20, pages 454-460