Published in Journal of the Arnold Arboretum, in 1957, in volume 38, pages 51-80

Published in Journal of the Arnold Arboretum, in 1957, in volume 38, pages 81-106

Published in Journal of the Arnold Arboretum, in 1957, in volume 38, pages 121-150

Published in Journal of the Arnold Arboretum, in 1957, in volume 38, pages 151-169

Published in Journal of the Arnold Arboretum, in 1957, in volume 38, pages 170-198

Published in Journal of the Arnold Arboretum, in 1957, in volume 38, pages 211-242

Published in Journal of the Arnold Arboretum, in 1957, in volume 38, pages 255-293

Published in Journal of the Arnold Arboretum, in 1957, in volume 38, pages 295-373

Published in Journal of The Arnold Arboretum, in 1957, in volume 38, issue 1, pages 1-50

Published in Journal of The Arnold Arboretum, in 1957, in volume 38, issue 1, pages 107-119

Published in Journal of The Arnold Arboretum, in 1957, in volume 38, issue 3, pages 243-254

Published in Journal of The Arnold Arboretum, in 1957, in volume 38, issue 4, pages 374-380

Published in Journal of The Arnold Arboretum, in 1957, in volume 38, issue 4, pages 381-388

Published in Journal of The Arnold Arboretum, in 1957, in volume 38, issue 4, pages 389-403

Published in Journal of The Arnold Arboretum, in 1957, in volume 38, issue 4, pages 404