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31. Railroad Centerlines: Lancaster County, Pennsylvania

2008. This line coverage contains arc features representing photogrammetrically interpreted Rail\r\nRoad centerlines. County Planning Commission supplied...

32. School District Boundaries: Lancaster County, Pennsylvania

2008. Boundaries of Lancaster County School Districts.

33. Snowmobile Trails - points: Pennsylvania

2008. PA Department of Conservation and Natural Resources. This data represents a small selection of snowmobile trails in Pennsylvania and was derived from the Statewide Trails Layer maintained by the DCNR ...

34. Snowmobile Trails: Pennsylvania

2008. PA Department of Conservation and Natural Resources. This data represents a small selection of snowmobile trails in Pennsylvania and was derived from the Statewide Trails Layer maintained by the DCNR ...

35. Turnpike Toll Plazas: Pennsylvania

2008. Pennsylvania Department of Transportation, Bureau of Planning and Research, Geographic Information Division. point locations of Pennsylvania turnpike toll plazas.

36. Zebra Mussel Distribution: United States

2008. U.S. Geological Survey. The concern caused by the explosive spread of the zebra mussel, (Dreissena polymorpha), within the United States resulted in passage of the Nonindi...