Published in Ohio Journal of Science, in 1920, in volume 20, pages 153-166

Created: 2010-11-20, modified: 2023-02-16

Published in Ohio Journal of Science, in 1920, in volume 20, pages 205-208

Created: 2012-09-11, modified: 2012-09-11

Published in The Ohio Journal of Science, in 1920, in volume 20, issue 6, pages 193-203

Created: 2011-05-23, modified: 2023-02-16

Published in Ohio Journal of Science, in 1920, in volume 21, pages 83-88

Created: 2010-11-20, modified: 2017-01-06