Published in Journal of The Arnold Arboretum, in 1924, in volume 5, issue 2, pages 84-107

Published in Journal of The Arnold Arboretum, in 1924, in volume 5, issue 2, pages 108-134

Published in Journal of The Arnold Arboretum, in 1924, in volume 5, issue 2, pages 134-135

Published in Journal of The Arnold Arboretum, in 1924, in volume 5, issue 4, pages 243-256