Humble Oil and Refining Company (Incorporated in Texas)
| Role | Title | Holding Repository | |
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| referencedIn | Ricker, Norman Hurd, 1896-1980. Norman Hurd Ricker papers, 1920-1980. | American Institute of Physics |
| Role | Title | Holding Repository |
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| associatedWith | Ricker, Norman Hurd, 1896-1980. | person |
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