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1,200 billion dollars 11 inches 275 million 360 million ahead America's timber amount Annual better guality trees billion board-feet billion cubic feet Canada commercial forest land crops cull trees demand for wood desirable trees Destructive agents East ever-increasing farm faster fire forest industries forestry job forestry knowledge future timber supplies greater gross national product grounds for complacence grow trees growing condition Growth of eastern growth-cut hardwood harvesting high-quality inches d.b.h. increase insect and disease kinds of trees knowledge and skills Lands Productive left unused long-time Main Reliance Medium meet future timber million acres million by 2000 Nation's forest one-fifth owner ownerships PERCENT OF AREA plant residues population present consumption prices rise Projection pulpwood recently cut lands salvage satisfactory substitute sawtimber growth skills promptly small forests small private softwood sawtimber South three-fourths timber being cut timber cut Timber Growth timber products timber resources timberland tremendous volume West