Published in Journal of The Arnold Arboretum, in 1923, in volume 4, issue 1, pages 8-33

Created: 2016-07-07, modified: 2016-07-07

Published in Journal of The Arnold Arboretum, in 1923, in volume 4, issue 4, pages 255-265

Created: 2016-07-07, modified: 2016-07-07