Published in Kansas University Science Bulletin, in 1911, in volume 5, pages 275-287
Created: 2011-11-26, modified: 2011-11-26
Published in Kansas University Science Bulletin, in 1911, in volume 5, pages 289-295
Created: 2011-11-26, modified: 2011-11-26
Published in Kansas Univ. Sci. Bull, in 1911, in volume 5, pages 297-306
Created: 2011-06-04, modified: 2011-06-21