Eliminating Three Miles of Grade Crossings
- 期刊名称Scientific American
- 作者Skerrett, Robert G.
- 卷第127卷
- 期第3期
- 印刷ISSN0036-8733
- 文件大小630.18KB
- 发表时间1922-9
- DOI10.1038/scientificamerican0922-186
- 页码186-187
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