Published in Journal of the Arnold Arboretum, in 1928, in volume 9, pages 130-131

Published in Journal of the Arnold Arboretum, in 1928, in volume 9, pages 144-145

Published in Journal of The Arnold Arboretum, in 1928, in volume 9, issue 4, pages 173-187

Published in Journal of The Arnold Arboretum, in 1928, in volume 9, issue 4, pages 193-199

Published in Journal of The Arnold Arboretum, in 1928, in volume 9, issue 2/3, pages 131-137