Published in Bulletin of The Southern California Academy of Sciences, in 1952, in volume 51, pages 1-3

Published in Bulletin of the Southern California Academy of Sciences, in 1952, in volume 51, pages 4-8

Published in Bulletin of the Southern California Academy of Sciences, in 1952, in volume 51, pages 9-20

Published in Bulletin of the Southern California Academy of Sciences, in 1952, in volume 51, pages 60-62

Published in Bulletin of the Southern California Academy of Sciences, in 1952, in volume 51, issue 2, pages 50-54

Published in Bulletin of the Southern California Academy of Sciences, in 1952, in volume 51, issue 2, pages 55-59

Published in Bulletin of the Southern California Academy of Sciences, in 1952, in volume 51, issue 3, pages 71-78