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Black Spruce in the North Central States

C. H. TubbsDon H. BoelterDonald A. PeralaDorothy H. AndersonIvan L. SanderJohn W. BenzieKimberly I. HardinLinda R. DonoghueRichard Cary SchlesingerRichard S. SartzStephen R. ShifleyT L. WagnerWilliam F. JohnstonKeith E. Evans

出版	Department of Agriculture, Forest Service, North Central Forest Experiment Station, 1977
URL	http://books.google.com.hk/books?id=dlZlvgEACAAJ&hl=&source=gbs_api