GIS
From Wildbison
Buffalo Field Campaign GIS Map Server
Greater yellowstone Online Atlas
USGS topographic maps of Montana http://maps2.nris.state.mt.us/scripts/esrimap.dll?name=LocMap&Cmd=Map
USGS topographic maps of Wyoming http://wgiac2.state.wy.us/html/aboutDRG.asp
USGS topographic maps of Idaho http://inside.uidaho.edu/geodata/USGS/DRG.htm
Montana fisheries information system http://maps2.nris.mt.gov/scripts/esrimap.dll?name=MFISH&Cmd=INST
towship&range to latitude and longitude convertor http://www.esg.montana.edu/gl/trs-data.html
USGS GISDATA Map Studio http://ims.cr.usgs.gov/
National Atlas, raw data download http://nationalatlas.gov/atlasftp.html
Backcountry Maps(great site for viewing topo maps) http://backcountrymaps.com/
West Yellowstone snotel site http://www.wcc.nrcs.usda.gov/nwcc/sntl-datarpt.jsp?site=924&days=7&state=MT
USGS streamflow data for Montana http://waterdata.usgs.gov/mt/nwis/current?type=flow
Gallatin National Forest fire information http://www.fs.fed.us/r1/gallatin/?page=fire
Shaded relief maps of western states from USGS http://wwwflag.wr.usgs.gov/USGSFlag/Data/maps/shadedRel.html