Petroleum Abstracts
| Searching System
| Petroleum Abstracts | |
| telecom. | 石油文摘; 石油文摘 |
| searching system | |
| agric. | 搜索系统 |
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| 刊名，美国石油文摘; 石油文摘美 | |||
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Petroleum Abstracts : 8 phrases in 3 subjects |
| Economics | 2 |
| General | 1 |
| Telecommunications | 5 |