["NATURE \/ Plants \/ Trees","Forest ecology.","Forest ecology;West (U.S.)","West (U.S.);Description.","FORESTRY (SPECIFIC ASPECTS)","Field Guide","Forest ecology.","Forest ecology;West (U.S.)","GENERAL","General Adult","NATURE \/ Plants \/ Trees","Nature\/Ecology","Non-Fiction","PLANT ECOLOGY","Pictorial treatment","United States","West (U.S.);Description."]