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1. USDA, National Agricultural Statistics Service, 2002, 2008, 2009, 2010, 2011 Pennsylvania Cropland Data Layer

2012. United States Department of Agriculture (USDA), National Agricultural Statistics Service (NASS), Research and Development Division, Geospatial Information Branch, Spatial Analysis Research Section (SARS). The USDA, NASS Cropland Data Layer (CDL) is a raster, geo-referenced, crop-specific land cover data layer. The 2011 CDL has a ground resolution of ...