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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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