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Published in Journal of The Washington Academy of Sciences, in 1921, in volume 8, pages 532-535

Published in Journal of the Washington Academy of Sciences, in 1921, in volume 11, pages 487-493

Published in Journal of The Washington Academy of Sciences, in 1921, in volume 11, issue 6, pages 125-135

Published in Journal of The Washington Academy of Sciences, in 1921, in volume 11, issue 7, pages 155-160

Published in Journal of The Washington Academy of Sciences, in 1921, in volume 11, issue 8, pages 173-189

Published in Journal of the Washington Academy of Sciences, in 1921, in volume 11, issue 18, pages 434-437