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- Conoco Travel Bureau11
- Continental Oil Company9
- Phillips Petroleum Company8
- Shell Oil Company8
- Shell Union Oil Corporation8
- Standard Oil Company (Indiana)2
- Standard Oil Company of California2
- Cities Service Oil Company1
- Montana. Dept. of Highways1
- Montana. State Highway Commission1
- Richfield Oil Corporation1
- Salt Lake City Corporation1
- Shell Canada Products Limited1
- Shell Oil Corporation1
- Standard Oil Company1
- Standard Oil Company of Texas1
