Published in J. Washington Acad. Sci., in 1915, in volume 5, pages 116-122

Published in Journal of the Washington Academy of Sciences, in 1915, in volume 5, pages 213-218

Published in Washington Dc J Acad Sci, in 1915, in volume 5, pages 429-433

Published in Journal of the Washington Academy of Sciences, in 1915, in volume 5, pages 433-436

Published in Journal of The Washington Academy of Sciences, in 1915, in volume 5, issue 2, pages 57-59

Published in Journal of The Washington Academy of Sciences, in 1915, in volume 5, issue 3, pages 72-76

Published in Journal of The Washington Academy of Sciences, in 1915, in volume 5, issue 8, pages 287-289

Published in Journal of The Washington Academy of Sciences, in 1915, in volume 5, issue 10, pages 355-360

Published in Journal of The Washington Academy of Sciences, in 1915, in volume 5, issue 11, pages 391-396

Published in Journal of The Washington Academy of Sciences, in 1915, in volume 5, issue 13, pages 468-474