Geographic distribution of the pines of the world, by William B.Critchfield and Elbert L.Little, Jr.

by Critchfield, William Burke.
Washington, U.S. Dept. of Agriculture, Forest Service; [for sale by the Superintendent of Documents, U.S. Govt. Print. Off.] 1966.

Series: Miscellaneous publication (United States. Department of Agriculture - Forest Service) ; 991.