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1921年4月9日

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铁轨与铁路

关于新旧钢轨年度交通量的一些事实和数据

作者：Robert G. Skerrett

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This article was originally published with the title “Rails and Railroads” in 大众科学 Magazine Vol. 124 No. 15 (April 1921), p. 287
doi:10.1038/scientificamerican04091921-287

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