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April 20
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1909, in volume 61, pages 193
January 19
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1909, in volume 61, pages 2
Elections during 1909
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1909, in volume 61, pages 586-587
March 2
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1909, in volume 61, pages 176