article by L J Brass published 1938 in Journal of the Arnold Arboretum

scientific article published in January 1966

scientific article published in January 1960

scientific article published in 1963

scientific article published in 1940

scientific article published in 1942

scientific article published in 1953

scientific article published in 1959

scientific article published in 1956

scientific article published in 1964

scientific article published in 1941

scientific article published in 1941

article by Charles Paul Alexander et al published 1960 in American Museum Novitates

scientific article published in 1962