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Some of the more useful places for downloading GIS data are:
General Spatial Data:
National Elevation Dataset: http://ned.usgs.gov/
US EPA Multi Resolution Land Cover Data: http://www.epa.gov/mrlc/nlcd.html
US EPA National Land Cover Data: http://landcover.usgs.gov/natllandcover.asp
USGS portal: http://edcwww.cr.usgs.gov/
USGS Direct Data Download Site: http://edc.usgs.gov/geodata/
Wyoming GIS Center: http://www.wygisc.uwyo.edu/clearinghouse/
USGS National Atlas: http://www-atlas.usgs.gov/
EPA Surf your watershed: http://www.epa.gov/surf/
USGS Land Processes Archive: http://edcdaac.usgs.gov/main.html
GIS Data Depot: http://data.geocomm.com/
NRCS SSURGO: http://www.ncgc.nrcs.usda.gov/branch/ssb/products/ssurgo/
NRCS STATSGO: http://www.ftw.nrcs.usda.gov/stat_data.html
USGS Sediment Data: http://webserver.cr.usgs.gov/sediment/
GAP home page: http://www.gap.uidaho.edu/default.htm
BLM public data: ftp://ftp.blm.gov/pub/gis/
Remote Sensing Data:
USGS Global Visualization Server (GLOVIS): http://glovis.usgs.gov/
EROS Data Center: http://redhook.gsfc.nasa.gov/~imswww/hidden/imswelcome/
ARIA: http://aria.arizona.edu/
NASA SRTM: http://www2.jpl.nasa.gov/srtm/
Need to buy textbooks?
a. On-line booksellers (used and new)
Addall: http://www.addall.com/
AbeBooks: http://www.abebooks.com/
Amazon: http://www.amazon.com
Big Words: http://bigwords.com/store/
O'Reilly: http://www.oreilly.com/
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