| 其他書名 | III. Effect on Exhaust-gas Composition of Operating Engines in Mixtures of Normal Air and Natural Gas |
| 出版 | U.S. Department of the Interior, Bureau of Mines, 1941 |
| URL | http://books.google.com.hk/books?id=Xqzi5c-Eja8C&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |