By Kmusser – Own work, Elevation data from SRTM, hydrologic data from the National Hydrography Dataset, urban areas from Vector Map, all other features from the National Atlas., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=12520461
By Kmusser – Own work, Elevation data from SRTM, hydrologic data from the National Hydrography Dataset, urban areas from Vector Map, all other features from the National Atlas., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=12520461