Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1852, in volume 6, pages 45-49

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1852, in volume 6, pages 65-68

Published in Proc. Acad. Nat. Sci. Philadelphia, in 1852, in volume 6, pages 68-70

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1852, in volume 6, pages 73-86

Published in Proc. Acad. Nat. Sci. Philadelphia, in 1852, in volume 6, pages 125-129

Published in Proc. Acad. Nat. Sci. Philadelphia, in 1852, in volume 6, pages 174-177

Published in Proc. Acad. Nat. Sci. Philadelphia, in 1852, in volume 6, pages 177-182

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1852, in volume 6, pages 182-183

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1852, in volume 6, pages 189-191

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1852, in volume 6, pages 325

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1852, in volume 6, pages 375

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1852, in volume 6, pages 376-378

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1852, in volume 6, pages 379-381

Published in Proc. Acad. Nat. Sci. Philadelphia, in 1852, in volume 1852, pages 203-205