Published in Journal of the Arnold Arboretum, in 1960, in volume 41, pages 1-35

Published in Journal of the Arnold Arboretum, in 1960, in volume 41, pages 47-72

Published in Journal of the Arnold Arboretum, in 1960, in volume 41, pages 197-212

Published in Journal of the Arnold Arboretum, in 1960, in volume 41, pages 213-258

Published in Journal of the Arnold Arboretum, in 1960, in volume 41, pages 270-278

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 1, pages 73-109

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 2, pages 111-140

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 2, pages 141-151

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 2, pages 164-190

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 2, pages 191-196

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 3, pages 231-258

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 3, pages 259-269

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 3, pages 279-286

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 3, pages 287-297

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 4, pages 341-356

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 4, pages 357-390

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 4, pages 391-411

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 4, pages 414-428

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 4, pages 443-445

Published in Journal of The Arnold Arboretum, in 1960, in volume 41, issue 4, pages 446