Echo Oil and Gas Company.
Archival Resources
| Role | Title | Holding Repository | |
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| referencedIn | Ellinghausen, John G. John G. Ellinghausen papers 1910-1961. | The University of Tulsa, McFarlin Library |
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| Relation | Name | |
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| associatedWith | Ellinghausen, John G. | person |
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