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Published in Journal of The Washington Academy of Sciences, in 1920, in volume 10, issue 1, pages 9-21

Published in Journal of The Washington Academy of Sciences, in 1920, in volume 10, issue 10, pages 286-297

Published in Journal of The Washington Academy of Sciences, in 1920, in volume 10, issue 15, pages 432-433

Published in Journal of The Washington Academy of Sciences, in 1920, in volume 10, pages 505-508

Published in Journal of The Washington Academy of Sciences, in 1920, in volume 10, pages 389-390

Published in Journal of The Washington Academy of Sciences, in 1920, in volume 10, pages 313-314

Published in Journal of The Washington Academy of Sciences, in 1920, in volume 10, pages 460-468

Published in Journal of The Washington Academy of Sciences, in 1920, in volume 10, pages 171-174

Published in Journal of The Washington Academy of Sciences, in 1920, in volume 10, pages 117-122

Published in Journal of The Washington Academy of Sciences, in 1920, in volume 10, pages 565-572