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age Mean d.b.h. Average specific gravity Cent central Florida Circled numbers indicate comparison trees d.b.h. Specific gravity Davy Crockett east-west trend Eastern white pine Forest Prod Forest Products Laboratory Forest Service 1965 Francis Marion geographic variation Georgia gravity and number gravity of slash gravity values increased increased from north indicate National Forest isograms Larson loblolly pine LONGLEAF PINE Louisiana major southern pine Mean age Mean Mean d.b.h. Specific mean specific gravity Mean Standard deviation Mitchell and Wheeler National Forest areas natural growing range North Carolina north to south number of sample Number Years Inches numbers indicate National pine Pinus Range Mean Standard sample locations Sample trees Mean SAND PINE Saucier shaded area shortleaf pine slash pine southern pine species specific gravity values Standard deviation Number superior tree candidates Tappi Tennessee Texas trees in parentheses trees Mean age U.S. D.A. Forest Serv U.S.D.A. Forest Service variation in specific Virginia pine Zobel