Published in Journal of the Arnold Arboretum, in 1973, in volume 54, pages 42-93

Published in Journal of the Arnold Arboretum, in 1973, in volume 54, pages 94-104

Published in Journal of the Arnold Arboretum, in 1973, in volume 54, pages 315-321

Published in Journal of the Arnold Arboretum, in 1973, in volume 54, pages 322-327

Published in Journal of the Arnold Arboretum, in 1973, in volume 54, pages 377-411

Published in Journal of the Arnold Arboretum, in 1973, in volume 54, pages 422-434

Published in Journal of the Arnold Arboretum, in 1973, in volume 54, pages 435-470

Published in Journal of the Arnold Arboretum, in 1973, in volume 54, pages 471-473

Published in Journal of The Arnold Arboretum, in 1973, in volume 54, issue 1, pages 105-110

Published in Journal of The Arnold Arboretum, in 1973, in volume 54, issue 1, pages 111-119

Published in Journal of The Arnold Arboretum, in 1973, in volume 54, issue 1, pages 120

Published in Journal of The Arnold Arboretum, in 1973, in volume 54, issue 2, pages 160-227

Published in Journal of The Arnold Arboretum, in 1973, in volume 54, issue 2, pages 293-308

Published in Journal of The Arnold Arboretum, in 1973, in volume 54, issue 2, pages 309-314

Published in Journal of The Arnold Arboretum, in 1973, in volume 54, issue 3, pages 369-376

Published in Journal of The Arnold Arboretum, in 1973, in volume 54, issue 4, pages 419-421