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並前往https://books.google.com.tw/books?id=P7MRzh5GJ20C&pg=PA16&lpg=PA16&dq=Class+Central&source=bl&ots=s42p6GOkk7&sig=ACfU3U2iuCKQ3yvZSTaZb2kIUPzEYlMe4w&hl=zh-TW&sa=X&ved=2ahUKEwih47yrp6L_AhW5ppUCHXjtBtoQ6AF6BQi3AhAD

Timber Resource of Wisconsin's Central Survey Unit, 1983

Area of land by land class , Central Unit , Wisconsin , 1968 and 1983 ( In thousand acres ) 1 / u.s . Department of Commerce , Bureau of Census , 1960 .

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