Published in University of Kansas Science Bulletin, in 1941, in volume 27, pages 61-69

Published in University of Kansas Science Bulletin, in 1941, in volume 27, pages 71-77

Published in University of Kansas Science Bulletin, in 1941, in volume 27, pages 105-132

Published in University of Kansas Science Bulletin, in 1941, in volume 27, pages 141-167