Helvetia Mining Company.
Archival Resources
| Role | Title | Holding Repository | |
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| referencedIn | Johns, T. R. (Thomas Richards), 1865-1944. T.R. Johns papers, 1853-1948 (bulk 1919-1940). | Pennsylvania State University Libraries |
Bibliographic and Digital Archival Resources
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| Relation | Name | |
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| associatedWith | Johns, T. R. (Thomas Richards), 1865-1944. | person |
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