| National Wetlands Inventory (NWI) | http://wetlands.fws.gov/ |
| GIS Data Depot | http://www.gisdatadepot.com/ |
| Texas Natural Resources Information System (TNRIS) | http://www.tnris.state.tx.us/ |
| Texas Parks & Wildlife | http://www.tpwd.state.tx.us |
| Soil Survey Geographic (SSURGO) Data Base | http://www.ftw.nrcs.usda.gov/ssur_data.html |
| Texas General Land Office (GLO) – Base Map Data | http://www.glo.state.tx.us/gisdata/gisdata.html |
| Census 2000 TIGER/Line Data | http://www.esri.com/data/download/census2000_tigerline/index.html |
| Texas Coastal Watershed Program |