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, pages 180-196
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, 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