Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1850, in volume 6, pages 243-269
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 21
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 5-8
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 204-205
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 230-234
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 358-362
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 72-79
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 159-160
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 67-70
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 160-168
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 263-266
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 261
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 94-95
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 144
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 35-36
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 119
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 8-9
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 323-328
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1850, in volume 5, pages 10-11