Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 568-597

Published in Proc. Acad. Nat. Sci. Philad., in 1901, in volume 53, issue 3, pages 612-613

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 324-326

Published in Proceedings Academy Natural Sciences Philadelphia, in 1901, in volume 53, pages 126-141

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1901, in volume 53, pages 370-382

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 211-212

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 273-288

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 272

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 492-495

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 509-511

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 552

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 778

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 327-341

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 223-260

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 617

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 192

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 503-508

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 607-608

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 751-752

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 486-490

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 647-656

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 465-485

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 10-110

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 383

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 598-601

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 602-603

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 450-456

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 3

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 748-751

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 295-302

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 771-772

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 774

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 512

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 657-739

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 491

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 213-215

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 622-646

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1901, in volume 53, pages 169-181