Published in University of Kansas Science Bulletin, in 1932, in volume 20, pages 243-245

Published in University of Kansas Science Bulletin, in 1932, in volume 20, pages 247-249

Published in University of Kansas Science Bulletin, in 1932, in volume 20, pages 251-261

Published in University of Kansas Science Bulletin, in 1932, in volume 20, pages 263-271

Published in University of Kansas Science Bulletin, in 1932, in volume 20, pages 273-295

Published in Kansas University Science Bulletin, in 1932, in volume 20, pages 313-315