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Creator
- Owen, Andrew23
- Murphy, Brendan20
- United States. Soil Conservation Service7
- Levinson, David M6
- Irvine, William, 1741-18043
- Ellicott, Andrew, 1754-18201
- Pennsylvania. Bureau of Topographic and Geologic Survey1
- Pennsylvania. Public Service Commission1
- Pittsburgh (Pa.). Department of City Planning1
- Sheafer, P. W. (Peter Wenrick), 1819-1