Published in Proc. Calif. Acad. Sci., San Francisco (4), in 1956, in volume 28, pages 441-527

Published in Proc. Calif. Acad. Sci., San Francisco, in 1956, in volume 28, pages 561-613

Published in Proc. Calif. Acad. Sci. (4), in 1956, in volume 29, issue 1, pages 1-19

Published in Proc. Calif. Acad. Sci. (4), in 1956, in volume 28, pages 615-621

Published in Proc. Calif. Acad. Sci. (4), in 1956, in volume 28, pages 529-560

Published in Proceedings of the California Academy of Sciences, in 1956, in volume 28, pages 393-404

Published in Proceedings of the California Academy of Sciences, in 1956, in volume 28, pages 415-423