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June 17th
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1856, in volume 8, pages 105-108
August 19th
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1856, in volume 8, pages 144
September 2d, 1856
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1856, in volume 8, pages 161
September 16th
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1856, in volume 8, pages 162-163
October 7th, 1856
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1856, in volume 8, pages 215
November 11th
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1856, in volume 8, pages 260-261