Published in Proceedings of the California Academy of Sciences, in 1920, in volume 9, pages 331-356

Published in Proceedings of the California Academy of Sciences, in 1920, in volume 9, pages 357-365

Published in Proceedings of the California Academy of Sciences, in 1920, in volume 9, pages 367-396

Published in Proceedings of the California Academy of Sciences, in 1920, in volume 10, pages 1-27

Published in Proc. Calif. Acad. Sci., San Francisco, in 1920, in volume 10, pages 29-30

Published in Proc. Calif. Acad. Sci., San Francisco, in 1920, in volume 10, pages 31-34

Published in Proceedings of the California Academy of Sciences, in 1920, in volume 10, pages 33-34

Published in Proceedings of the California Academy of Sciences, in 1920, in volume 10, pages 35-46

Published in Proc. Calif. Acad. Sci. ser. 4, in 1920, in volume 10, pages 47-49

Published in Proc. Calif. Acad. Sci. ser. 4, in 1920, in volume 10, pages 51-52

Published in Proceedings of the California Academy of Sciences, in 1920, in volume 10, pages 53-70

Published in Proc. Calif. Acad. Sci, in 1920, in volume 10, pages 71-75