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1921年4月30日

1分钟阅读

美国褐煤

加拿大为使褐煤媲美无烟煤开辟道路

作者：Robert G. Skerrett

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This article was originally published with the title “American Lignite Coals” in 大众科学 Magazine Vol. 124 No. 18 (April 1921), p. 344
doi:10.1038/scientificamerican04301921-344

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