Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 29
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 45
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 49
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 53-69
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 78-80
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 90
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 91-94
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 95
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 98-101
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 129
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 134-135
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Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 156-158
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 166-168
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 169-179
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 188-189
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 189-190
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 258-265
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 271-273
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 277-279
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 283
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 303-311
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 311-312
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 313-340
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 344
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 347
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 348
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 349-407
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 408-409
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 410
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 411-416
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 417-420
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 433-434
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 440
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Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, pages 442-444
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Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1889, in volume 41, issue 2, pages 280-281
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Published in Proceedings of the Academy Philadelphia, in 1889, in volume 1889, pages 127-129
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Published in Proc. Acad. nat. Sci. Philad., in 1889, in volume 1889, pages 341-343
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