Published in Jour Washington Acad Sci, in 1930, in volume 20, pages 1-3

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 25-28

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Published in Jour Washington Acad Sci, in 1930, in volume 20, pages 35-41

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Published in Jour Washington Acad Sci, in 1930, in volume 20, pages 59-60

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 82-83

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 83-84

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 87-88

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 107-114

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 116-117

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 225-241

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 317-331

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Published in Jour Washington Acad Sci, in 1930, in volume 20, pages 331-340

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Published in Jour Washington Acad Sci, in 1930, in volume 20, pages 370-372

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 381-384

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Published in Jour Washington Acad Sci, in 1930, in volume 20, pages 395-396

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Published in Jour Washington Acad Sci, in 1930, in volume 20, pages 398-418

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 421-432

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 432-434

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 434-435

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 465-475

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, pages 488-495

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Published in Jour Washington Acad Sci, in 1930, in volume 20, pages 501-509

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, issue 2, pages 484-488

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, issue 15, pages 372-374

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, issue 15, pages 374-381

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Published in Journal of The Washington Academy of Sciences, in 1930, in volume 20, issue 16, pages 396-398

Created: 2015-03-16, modified: 2015-03-16