About ROLL-HANSEN F
About Norwegian Forest Research Inst.
About ROLL-HANSEN H
About Norwegian Forest Research Inst.
About Meddelelser fra Norsk Institutt for Skogforskning
About root rot
About Norway
About Forest tending
About Plant diseases caused by fungi
About ノルウェー
About 地域
About Picea
About Abies
About 根腐病