Published in Journal of The Arnold Arboretum, in 1921, in volume 2, issue 4, pages 204-216

Published in Journal of The Arnold Arboretum, in 1921, in volume 2, issue 4, pages 216-232

Published in Journal of The Arnold Arboretum, in 1921, in volume 2, issue 4, pages 232-236

Published in Journal of The Arnold Arboretum, in 1921, in volume 2, issue 4, pages 236-239

Published in Journal of The Arnold Arboretum, in 1921, in volume 2, issue 3, pages 153-156

Published in Journal of The Arnold Arboretum, in 1921, in volume 2, issue 3, pages 156-159

Published in Journal of The Arnold Arboretum, in 1921, in volume 2, issue 3, pages 159-160

Published in Journal of The Arnold Arboretum, in 1921, in volume 2, issue 3, pages 160-163

Published in Journal of The Arnold Arboretum, in 1921, in volume 2, issue 3, pages 164-174

Published in Journal of The Arnold Arboretum, in 1921, in volume 2, issue 3, pages 174-180

Published in Journal of The Arnold Arboretum, in 1921, in volume 2, issue 3, pages 181-184