Published in University of Kansas Science Bulletin, in 1940, in volume 26, pages 373-375

Published in University of Kansas Science Bulletin, in 1940, in volume 26, pages 377-383

Published in University of Kansas Science Bulletin, in 1940, in volume 26, pages 385-405

Published in University of Kansas Science Bulletin, in 1940, in volume 26, pages 407-439

Published in University of Kansas Science Bulletin, in 1940, in volume 26, pages 441-444

Published in University of Kansas Science Bulletin, in 1940, in volume 26, pages 445-487

Published in University of Kansas Science Bulletin, in 1940, in volume 26, pages 489-571