Category:History of Allegheny County, Pennsylvania
Appearance
Subcategories
This category has only the following subcategory.
P
Pages in category "History of Allegheny County, Pennsylvania"
The following 43 pages are in this category, out of 43 total. This list may not reflect recent changes.
C
M
P
- List of Pennsylvania state historical markers in Allegheny County
- Pittsburgh and Castle Shannon Plane
- Pittsburgh and Beck's Run Railroad
- Pittsburgh and Castle Shannon Railroad
- Pittsburgh Coal Company
- Pittsburgh Southern Railway
- Pittsburgh Steam Engine Company
- Pittsburgh, Virginia and Charleston Railway
- Pittsburgh and Western Railroad