Published in Proceedings of the Academy of Natural Sciences of Philadelphia. Philadelphia, in 1908, in volume 1907, pages 467-498
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, 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 112-127
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 59, pages 419-444
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 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 30
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 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 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 11
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 157
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 636-642
Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1908, in volume 60, pages 631-636