Published in Journal of the Arnold Arboretum, in 1961, in volume 42, pages 81-86

Published in Journal of the Arnold Arboretum, in 1961, in volume 42, pages 87-95

Published in Journal of the Arnold Arboretum, in 1961, in volume 42, pages 295-320

Published in Journal of the Arnold Arboretum, in 1961, in volume 42, pages 321-333

Published in Journal of the Arnold Arboretum, in 1961, in volume 42, pages 373-396

Published in Journal of the Arnold Arboretum, in 1961, in volume 42, pages 430-435

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 1, pages 1-9

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 1, pages 107-109

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 1, pages 110-111

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 1, pages 112-113

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 2, pages 115-143

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 2, pages 144-156

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 2, pages 157-164

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 2, pages 165-203

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 2, pages 219-262

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 3, pages 263-275

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 3, pages 276-294

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 3, pages 334-346

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 4, pages 397-415

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 4, pages 416-425

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 4, pages 426-429

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 4, pages 437-441

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 4, pages 442-446

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 4, pages 447-463

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 4, pages 464-467

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 4, pages 468

Published in Journal of The Arnold Arboretum, in 1961, in volume 42, issue 4, pages 469-477