| Petroleum industry and trade -- Texas -- History. Matches 1 item |
| Petroleum industry and trade -- United States. Matches 7 items |
| Petroleum industry and trade -- United States -- History. Matches 3 items |
| Petroleum industry and trade -- Venezuela. Matches 2 items |
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Petroleum -- Law and legislation -- United States. SEE: Petroleum law and legislation -- United States Matches 1 item
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| Petroleum law and legislation -- United States. Matches 1 item |
| Petroleum -- Migration -- Computer simulation. Matches 1 item |
| Petroleum -- Oklahoma -- Kay County. Matches 1 item |
| Petroleum -- Pennsylvania. Matches 1 item |
| Petroleum -- Pennsylvania -- Oil Creek Valley (Crawford County and Venango County) -- History -- Sources. Matches 1 item |