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並前往https://books.google.com.tw/books?id=tyCS3TwRvyYC&pg=PA18&lpg=PA18&dq=billion+board&source=bl&ots=3fau2IYRgf&sig=ACfU3U1-N2IoiaqFxbFG2FbcclQE96FokA&hl=zh-TW&sa=X&ved=2ahUKEwiOjeXpsLr2AhUVtKQKHQoWAzQQ6AF6BAhBEAM

USDA Forest Service Resource Bulletin PNW.

Douglas - fir is predominant on 98,000 acres of industry land , with a volume of 1.3 billion board feet , 18 percent of industry's sawtimber .

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