Published in Kansas University Science Bulletin, in 1938, in volume 25, pages 169-171

Published in University of Kansas Science Bulletin, in 1938, in volume 25, pages 229-237

Published in University of Kansas Science Bulletin, in 1938, in volume 25, pages 239-258

Published in University of Kansas Science Bulletin, in 1938, in volume 25, pages 259-314

Published in University of Kansas Science Bulletin, in 1938, in volume 25, pages 315-355

Published in University of Kansas Science Bulletin, in 1938, in volume 25, pages 357-383

Published in University of Kansas Science Bulletin, in 1938, in volume 25, pages 385-405

Published in The University of Kansas Science Bulletin, in 1938, in volume 25, pages 407-419

Published in University of Kansas Science Bulletin, in 1938, in volume 25, pages 421-445

Published in University of Kansas Science Bulletin, in 1938, in volume 25, pages 447-575