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1. USGS Geopdfs for Pennsylvania 30 x 60 Minute

2011. U.S. Geological Survey. GeoPDF 30 x 60 Minute Quadrangle Map for Pennsylvania.

2. USGS High Resolution Orthoimagery for Harrisburg, Pennsylvania

2011. U.S. Geological Survey. This data set consists of 0.3-meter pixel resolution (approximately 1-foot), natural color orthoimages covering the urban area footprint. An orthoi...

3. USGS High Resolution Orthoimagery for Harrisburg, Pennsylvania - Tile Index

2011. U.S. Geological Survey. TILE INDEX - 'This data set consists of 0.3-meter pixel resolution (approximately 1-foot), natural color orthoimages covering the urban area footpr...