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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 Volcanoes, 2012
2005. Smithsonian Institution, Global Volcanism Program, National Atlas of the United States, and the United States Geological Survey and Environmental Systems Research Institute (Redlands, Calif.). United States Volcanoes is a polygon theme representing volcanoes thought to be active in the last 10,000 years (Holocene), in and near the United ... Esri.