1916年7月1日

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顽皮的海豚及其经济价值，乡村砖路成本，等等

作者：Robert G. Skerrett

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大众科学 Magazine Vol 115 Issue 1This article was originally published with the title “The Playful Porpoise and its Economic Value, Cost of Brick Roads in the Country, and more” in 大众科学 Magazine Vol. 115 No. 1 (), p. 3
doi:10.1038/scientificamerican07011916-3
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