1916年7月1日

1分鐘閱讀

頑皮的海豚及其經濟價值，鄉村磚路成本，等等

作者：Robert G. Skerrett

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大眾科學 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 大眾科學 Magazine Vol. 115 No. 1 (), p. 3
doi:10.1038/scientificamerican07011916-3
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