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Subdivisions of the Genus Pinus (Pines)
by Elbert L. Little, jr. and William B. C...
Bok Engelsk 1969
Geographic distribution of the pines of the world
by William B. Critchfield and Elbert L. L...
Bok Engelsk 1966
The physiology of forest trees : a symposium held at the Harvard Forest, April, 1957
edited by Kenneth V. Thimann ; with the a...
Bok Engelsk 1958
Geographic variation in Pinus Contorta
by William B. Critchfield
Bok Engelsk 1957