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Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 105-107

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Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 129-135

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Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 135-140

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Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 141-145

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Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 173-179

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Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 181-187

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Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 196-203

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Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 259-260

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Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 261-263

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Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 285-288

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Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 296-308

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Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 311-315

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Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 348-355

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Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 384-388

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Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 388-398

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Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 399-403

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Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 409-415

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Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 432-440

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Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, pages 466-481

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Published in Jour Washington Acad Sci, in 1941, in volume 31, pages 501-503

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Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, issue 3, pages 96-105

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Published in Journal of The Washington Academy of Sciences, in 1941, in volume 31, issue 5, pages 188-195

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Published in Journal of The Washington Academy of Sciences, in 1941, in volume 32, pages 153-150

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Published in Journal of The Washington Academy of Sciences, in 1941, in volume 32, issue 6, pages 184-187

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