Published in Proc. Calif. Acad. Sci. (4), in 1951, in volume 27, pages 1-14

Published in Proc. Calif. Acad. Sci., in 1951, in volume 27, pages 17-58

Published in Proc. Calif. Acad. Sci., San Francisco, in 1951, in volume 27, pages 65-75

Published in Proc. Calif. Acad. Sci., San Francisco, in 1951, in volume 27, pages 77-132

Published in Proc. Calif. Acad. Sci., in 1951, in volume 27, pages 133-158

Published in Proc. Calif. Acad. Sci., in 1951, in volume 27, pages 159-176