Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1912, in volume 63, pages 551-571

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1912, in volume 64, pages 8-33

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1912, in volume 64, pages 60-128

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1912, in volume 64, pages 154-155

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1912, in volume 64, pages 157-168

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1912, in volume 64, pages 184-234

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1912, in volume 64, pages 235-276

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1912, in volume 64, pages 380-444

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1912, in volume 64, pages 455-488

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1912, in volume 64, pages 490

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1912, in volume 64, pages 492-498

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1912, in volume 64, pages 545-549

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1912, in volume 64, pages 549-551

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1912, in volume 64, pages 555-559