Published in Journal of The Arnold Arboretum, in 1920, in volume 1, issue 3, pages 147-171

Published in Journal of The Arnold Arboretum, in 1920, in volume 1, issue 3, pages 171-186

Published in Journal of The Arnold Arboretum, in 1920, in volume 1, issue 3, pages 186-190

Published in Journal of The Arnold Arboretum, in 1920, in volume 1, issue 3, pages 190-191

Published in Journal of The Arnold Arboretum, in 1920, in volume 1, issue 3, pages 191-210

Published in Journal of The Arnold Arboretum, in 1920, in volume 2, issue 2, pages 65-90

Published in Journal of The Arnold Arboretum, in 1920, in volume 2, issue 2, pages 90-105

Published in Journal of The Arnold Arboretum, in 1920, in volume 2, issue 2, pages 105-110

Published in Journal of The Arnold Arboretum, in 1920, in volume 2, issue 2, pages 111-112

Published in Journal of The Arnold Arboretum, in 1920, in volume 2, issue 2, pages 112-121

Published in Journal of The Arnold Arboretum, in 1920, in volume 1, issue 4, pages 211-232

Published in Journal of The Arnold Arboretum, in 1920, in volume 1, issue 4, pages 239-242

Published in Journal of The Arnold Arboretum, in 1920, in volume 1, issue 4, pages 242-245

Published in Journal of The Arnold Arboretum, in 1920, in volume 1, issue 4, pages 245-254

Published in Journal of The Arnold Arboretum, in 1920, in volume 1, issue 4, pages 254-263

Published in Journal of The Arnold Arboretum, in 1920, in volume 1, issue 4, pages 264

Published in Journal of The Arnold Arboretum, in 1920, in volume 1, issue 4, pages 267-277

Published in Journal of The Arnold Arboretum, in 1920, in volume 2, issue 1, pages 1-25

Published in Journal of The Arnold Arboretum, in 1920, in volume 2, issue 1, pages 25-41

Published in Journal of The Arnold Arboretum, in 1920, in volume 2, issue 1, pages 42-64