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MapAmerica's Industrial Heritage Project, southwestern Pennsylvania Each map covers 9 counties in southwestern Pennsylvania. "June 1989." Panel title. Maps numbered: 956-40021-DSC-June 89 [thru] 956-40028-DSC-June 89. Each map has a separate index. Text, large map titled "Our region helped...
- Contributor: United States. National Park Service - America's Industrial Heritage Project
- Date: 1989-01-01