Published in Proceedings of The American Philosophical Society, in 1918, in volume 56, pages 673-689

Published in Philadelphia Proceedings of the American Philosophical Society, in 1918, in volume 57, pages 521-526

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 1-48

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 49-59

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 60-68

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 69-98

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 99-111

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 112-129

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 130-143

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 144-154

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 155-172

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 173-292

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 293-343

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 344-353

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 354-356

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 357-374

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 375-439

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 440-478

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 479-490

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 513-520

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 627-631

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 632-648

Published in Proceedings of The American Philosophical Society, in 1918, in volume 57, issue 220, pages 649-668