Published in University of Kansas Science Bulletin, in 1947, in volume 31, pages 299-309

Published in University of Kansas Science Bulletin, in 1947, in volume 31, pages 543-589

Published in Univ. Kansas Sci. Bull., in 1947, in volume 31, issue 13, pages 283-298

Published in The University of Kansas science bulletin, in 1947, in volume 31, issue 16, pages 413-541