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