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January 3d, 1854
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1854, in volume 7, pages 1-2
May 2d, 1854
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1854, in volume 7, pages 69
June 6th
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1854, in volume 7, pages 88-90