Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 4-20

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1902, in volume 54, pages 21-22

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1902, in volume 54, pages 25-32

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 33-36

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 39-43

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 80-84

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 113

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 114

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 173

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 175-186

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 233-240

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 256

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 279-283

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 284-359

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 383-388

Published in Proceedings of the Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 389-412

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 413-442

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 461-504

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 507-509

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 512

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 517-533

Published in Proc. Acad. nat. Sci. Philad., in 1902, in volume 54, pages 534-592

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1902, in volume 54, pages 595-598

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1902, in volume 54, pages 629-637

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 696-716

Published in Proceedings of the Academy of Natural Sciences, Philadelphia, in 1902, in volume 54, pages 717-727

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 744-749

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 749

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 750-790

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 805-811

Published in Proceedings of The Academy of Natural Sciences of Philadelphia, in 1902, in volume 54, pages 812