Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 4
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 71-82
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 83
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 121-124
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 145-177
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 178
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Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 179-182
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 185-187
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 195-200
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Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 201-216
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 219-224
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 225
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 226
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 228-244
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 254-257
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 258
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 276-280
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 324-364
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 377-378
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 379
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 403-405
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 407-432
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 465
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 478
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 480-481
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 482-496
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 498-500
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 524
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 538-540
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 541-542
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 548-550
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 550
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1899, in volume 51, pages 551
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Published in Proceedings of the Academy of Natural Sciences, in 1899, in volume 51, issue 1, pages 5-62
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Published in Proc. Acad. Nat. Sci. Philadelphia, in 1899, in volume 1899, pages 183-184
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Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1899, in volume 1899, pages 259-275
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