Published in Journal of the Arnold Arboretum, in 1969, in volume 50, pages 1-35

Published in Journal of the Arnold Arboretum, in 1969, in volume 50, pages 36-75

Published in Journal of the Arnold Arboretum, in 1969, in volume 50, pages 76-79

Published in Journal of the Arnold Arboretum, in 1969, in volume 50, pages 104-123

Published in Journal of the Arnold Arboretum, in 1969, in volume 50, pages 180-196

Published in Journal of the Arnold Arboretum, in 1969, in volume 50, pages 599-619

Published in Journal of the Arnold Arboretum, in 1969, in volume 50, pages 620-625

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 1, pages 80-92

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 1, pages 93-98

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 1, pages 99-103

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 1, pages 124-137

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 1, pages 138-152

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 1, pages 153-157

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 2, pages 159-179

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 2, pages 225-267

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 2, pages 274-314

Published in Journal of the Arnold Arboretum, in 1969, in volume 50, issue 3, pages 315-369

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 3, pages 370-383

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 3, pages 384-410

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 3, pages 411-431

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 3, pages 432-448

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 3, pages 449-461

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 3, pages 462-468

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 3, pages 469-477

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 3, pages 478-480

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 4, pages 481-526

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 4, pages 527-555

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 4, pages 626-628

Published in Journal of The Arnold Arboretum, in 1969, in volume 50, issue 4, pages 629-649