Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 9
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 13-19
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 20-33
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 34-37
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 40-127
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 130-131
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 134
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Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 187-224
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 226-228
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 233-236
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Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 237-240
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 241
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 242
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 243
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 244-251
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 256-257
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 276-277
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 278-279
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 279
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 280
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 281
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 282-291
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 296-309
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 330-331
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 341
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 349-350
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 351
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 356-357
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 359
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 376-384
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 397-405
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 407
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 414-418
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 418-421
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 422-425
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1880, in volume 32, pages 428
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