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Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1908, in volume 59, pages 419-444

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 3-10

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 11

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1908, in volume 60, pages 12-23

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 30

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 52-70

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 112-127

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 128-156

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 157

Published in Proc. Acad. nat. Sci. Philad., in 1908, in volume 60, pages 158-318

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 321-364

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1908, in volume 60, pages 365-402

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 449-451

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 502-503

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 554

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 627-628

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 631-636

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 636-642

Published in Proceedings of the Academy of Natural Sciences of Philadelphia. Philadelphia, in 1908, in volume 1907, pages 467-498