2013. Geological Survey (U.S.). The Color Shaded Relief of Alaska map layer is a 100-meter resolution color-sliced elevation image of Alaska, with relief shading added to accentua... National Atlas of the United States.
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2013. United States. Environmental Protection Agency. Region IX. This polygon shapefile contains nonattainment areas for particulate matter < 10 microns. Nonattainment areas are geographic areas which have not... United States. Environmental Protection Agency. Region IX.
2013. California. Department of Water Resources. This point shapefile represents the depth to groundwater below the ground surface in California during spring of 2013. These data show depth to gro... California. Department of Water Resources.
2013. California. Department of Water Resources. This point shapefile represents groundwater elevation in California for spring 2013. This layer shows the depth to groundwater values collected fro... California. Department of Water Resources.
2013 and 2014. California. Department of Water Resources. This point shapefile represents changes in groundwater levels in California. These data represent groundwater changes between fall 2013 and fall 20... California. Department of Water Resources.
2013 and 2014. California. Department of Water Resources. This point shapefile represents changes in groundwater levels in California. These data represent groundwater changes between spring 2013 and sprin... California. Department of Water Resources.
2013. California. Department of Water Resources. This point shapefile represents the depth to groundwater below the ground surface in California during fall of 2013. These data show depth to groun... California. Department of Water Resources.
2013. California. Department of Water Resources. This point shapefile represents groundwater elevation in California for fall 2013. This layer shows the depth to groundwater values collected from ... California. Department of Water Resources.
2012 and 2013. California. Department of Water Resources. This point shapefile represents changes in groundwater levels in California. These data represent groundwater changes between spring 2012 and sprin... California. Department of Water Resources.
2012, 2013, 2014, and 2015. California. Department of Water Resources. This point shapefile represents changes in groundwater levels in California. These data represent groundwater changes between spring 2012 and sprin... California. Department of Water Resources.