Published in Proc. Calif. Acad. Sci., San Francisco (4), in 1950, in volume 24, pages 485-519

Published in Proc. Calif. Acad. Sci., San Francisco (4), in 1950, in volume 26, pages 355-417

Published in Proc. Calif. Acad. Sci. (4), in 1950, in volume 26, pages 419-466

Published in Proceedings of the California Academy of Sciences, in 1950, in volume 26, pages 467-481

Published in Proceedings of the California Academy of Sciences, in 1950, in volume 26, pages 483-505