"North Central Forest Experiment Station (Estados Unidos)," . . . . "Intensive plantation culture : twelve years research"@en . . . . "Intensive plantation culture : 12 years research" . . "Intensive plantation culture : 12 years research"@en . . . . . . . . . . . . . . "Intensive plantation culture 12 years research"@en . . . "Intensive plantation culture 12 years research" . "Intensive plantation culture 12 year research"@en . . . "Cultivos extensivos." . .