-
Railway Lines
Abstract: The Rail Network is a comprehensive database of the nation's railway system at the 1:100,000 scale. The data set covers all 50 States plus the District of Columbia.... -
USGS Water Resources: National Stream Quality Accounting Network and...
From the site: "This dataset and the accompanying Data Series report was created to assist in analysis and interpretation of water-quality data provided by the U.S. Geological... -
USGS Groundwater Watch: Real-Time Groundwater Level Network
From the site: "The Real Time Groundwater Level Network contains water levels and well information from wells with "real time" data transmission instrumentation. This network...