Keystone Bridge Company
Archival Resources
| Role | Title | Holding Repository | |
|---|---|---|---|
| referencedIn | Manhattan Railway Company. Manhattan Railway Company records, 1878-1915. | Columbia University in the City of New York, Columbia University Libraries | |
| creatorOf | Carnegie Steel Company. Carnegie Steel Company records 1853-1912 (1869-1912). | Historical Society of Western Pennsylvania, Heinz History Center Detre Library and Archives | |
| referencedIn | Helen Clay Frick Foundation. Helen Clay Frick Foundation archives, 1862-1987. | University of Pittsburgh |
Bibliographic and Digital Archival Resources
| Role | Title | Holding Repository |
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Filters:
| Relation | Name | |
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| associatedWith | Carnegie Steel Company. | corporateBody |
| associatedWith | Helen Clay Frick Foundation. | corporateBody |
| associatedWith | Manhattan Railway Company. | corporateBody |
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Corporate Body
Active 1853
Active 1912
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