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1. North America Electric Transmission Lines, 2009

2009. Platts (Firm). Electric Transmission Lines is a polyline theme representing electric power lines of transmission and sub-transmission voltages covering North Amer... Platts.

2. United States Historic Earthquakes, 2012

1568. National Atlas of the United States and the United States Geological Survey and Environmental Systems Research Institute (Redlands, Calif.). United States Historic Earthquakes is a point theme representing the locations of significant, historic earthquakes in United States and adjacent C... Esri.