Springfield Tunnel and Development Company.
| Role | Title | Holding Repository | |
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| creatorOf | Lanagan, William Henry, 1882-. Property of Springfield Tunnel & Devel. Co. : Columbia, Tuolumne Co., Calif. Map no. 1 accompany [sic] report of W.H. Lanagan, May 12th 1917. | UC Berkeley Libraries |
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| associatedWith | Lanagan, William Henry, 1882- | person |
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