For more USGS Publications, search the USGS Publications Warehouse.
Data Series 321: Illinois, Indiana, and Ohio Magnetic and Gravity Maps and Data: A Website for Distribution of Data.
Web mapping system containing political, geological, economic, and hydrological layers.
Repository of spatially reference data for the Indianapolis Metropolitan Statistical Area. Consists of Boone, Hamilton, Hancock, Hendricks, Johnson, Madison, Marion, Morgan, and Shelby Counties.