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February 19th
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 8-9
December 3d
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 119
Election of Members
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 144
May 20th
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 204-205
September 2d, 1851
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 261
September 16th
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 263-266
December 9th
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 323-328