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
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 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 121-150
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, pages 151-169