Published in Bulletin of The Southern California Academy of Sciences, in 1951, in volume 50, pages 156-158

Published in Bulletin of The Southern California Academy of Sciences, in 1951, in volume 50, pages 152-155

Published in Bulletin of The Southern California Academy of Sciences, in 1951, in volume 50, pages 86-88

Published in Bulletin of The Southern California Academy of Sciences, in 1951, in volume 50, pages 34-49

Published in Bulletin of The Southern California Academy of Sciences, in 1951, in volume 50, pages 25-33

Published in Bulletin of The Southern California Academy of Sciences, in 1951, in volume 50, pages 76-80

Published in Bulletin of The Southern California Academy of Sciences, in 1951, in volume 50, issue 3, pages 159-163

Published in Bulletin of the Southern California Academy of Sciences, in 1951, in volume 50, issue 3, pages 136-151

Published in Bulletin Southern California Academy of Sciences, in 1951, in volume 50, pages 50-54

Published in Bulletin of the Southern California Academy of Sciences, in 1951, in volume 50, issue 3, pages 119-127