Published in Journal of the Arnold Arboretum, in 1931, in volume 12, pages 49-59

Published in Journal of the Arnold Arboretum, in 1931, in volume 12, pages 206-217

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 1, pages 3-22

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 1, pages 23-25

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 1, pages 25-46

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 1, pages 46-49

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 2, pages 79-146

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 2, pages 146-147

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 3, pages 149-151

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 3, pages 151-156

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 3, pages 157-197

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 3, pages 197

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 3, pages 218-219

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 3, pages 219-220

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 4, pages 221-264

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 4, pages 264-269

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 4, pages 269-270

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 4, pages 270-275

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 4, pages 275-281

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 4, pages 281-287

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 4, pages 287-288

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 4, pages 289-296

Published in Journal of The Arnold Arboretum, in 1931, in volume 12, issue 4, pages 296-308