Published in Bulletin of The Southern California Academy of Sciences, in 1950, in volume 49, pages 3-9

Published in Bulletin of The Southern California Academy of Sciences, in 1950, in volume 49, pages 12-14

Published in Bulletin of The Southern California Academy of Sciences, in 1950, in volume 49, pages 29-35

Published in Bulletin of The Southern California Academy of Sciences, in 1950, in volume 49, pages 55-70

Published in Bulletin of The Southern California Academy of Sciences, in 1950, in volume 49, pages 79-89

Published in Bulletin of The Southern California Academy of Sciences, in 1950, in volume 49, pages 101-104