美国森林密度

作者：罗杰·道尔

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Rodger Doyle can be reached at rdoyle2@adelphia.net

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This article was originally published with the title “Forest Density in the U.S.” in 大众科学 Magazine Vol. 278 No. 4 (April 1998), p. 28
doi:10.1038/scientificamerican0498-28

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