Published in Proc Washington Academy of Sciences, in 1900, in volume 2, pages 133-156
Published in Proceedings of the Washington Academy of Sciences, in 1900, in volume 2, pages 631-649
Published in Proceedings of the Washington Academy of Sciences, in 1900, in volume 2, pages 389-464
Published in Proceedings of the Washington Academy of Sciences, in 1900, in volume 2, pages 83-109
Published in Proceedings of the Washington Academy of Sciences, in 1900, in volume 2, pages 203-246
Published in Proceedings of the Washington Academy of Sciences, in 1900, in volume 13, pages 157
Published in Proceedings of the Washington Academy of Sciences, in 1900, in volume 2, pages 513-517
Published in Proceedings of the Washington Academy of Sciences, in 1900, in volume 2, pages 523-537
Published in Proceedings of The Washington Academy of Sciences, in 1900, in volume 2, pages 157-159
Published in Proceedings of the Washington Academy of Sciences, in 1900, in volume 2, pages 367-388