Published in Proceedings of The California Academy of Sciences, in 1921, in volume 11, pages 395-398

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 11, pages 49-72

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 10, pages 77-117

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 11, pages 39-47

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 11, pages 95-98

Published in Proc. Calif. Acad. Sci. ser. 4, in 1921, in volume 11, pages 167-168

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 10, pages 119-127

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 11, pages 1-26

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 11, pages 99-102

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 11, pages 109-110

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 11, pages 111-134

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 11, pages 135-136

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 11, pages 137-144

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 11, pages 345-393

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 10, pages 128-158

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 11, pages 73-94

Published in Proceedings of the California Academy of Sciences, in 1921, in volume 11, pages 145-152

Published in Proceedings of The California Academy of Science (4Th Series), in 1921, in volume 11, pages 156-166

Published in Proceedings of The California Academy of Science (4Th Series), in 1921, in volume 11, pages 169-177

Published in Proceedings of The California Academy of Science (4Th Series), in 1921, in volume 11, pages 178-182

Published in Proceedings of the California Acadademy of Sciences, in 1921, in volume 11, pages 197-344

Published in Proceedings of the California Acadademy of Sciences, in 1921, in volume 11, pages 103-107

Published in Proc. California Acad. Sci. (Ser. 4), in 1921, in volume 11, pages 27-38

Published in Proceedings of the California Acadademy of Sciences, in 1921, in volume 11, pages 183-184