Published in Journal of the Arnold Arboretum, in 1956, in volume 37, pages 15-86

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 1, pages 1-14

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 2, pages 123-152

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 2, pages 153-159

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 2, pages 160-172

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 2, pages 173-179

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 3, pages 197-216

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 3, pages 269-287

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 3, pages 307-313

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 3, pages 314-316

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 4, pages 366-372

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 4, pages 373-374

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 4, pages 375-401

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 4, pages 401-402

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 4, pages 403

Published in Journal of The Arnold Arboretum, in 1956, in volume 37, issue 4, pages 405-411

Published in Journal of the Arnold Arboretum, in 1956, in volume 37, pages 217-268

Published in Journal of the Arnold Arboretum, in 1956, in volume 37, pages 180-196