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Published in Proc. Biol. Soc. Washington, in 1937, in volume 50, pages 83-86

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Published in Proceedings of The Biological Society of Washington, in 1937, in volume 50, pages 87-91

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Published in Proceedings of The Biological Society of Washington, in 1937, in volume 50, pages 95-102

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Published in Proc. Biol. Soc. Washington,, in 1937, in volume 50, pages 125-128

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Published in Proceedings of The Biological Society of Washington, in 1937, in volume 50, pages 141-144

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