The state of Alaska Department of Natural Resources (DNR) has a series of maps showing the Iditarod Race trail laid over shaded relief topo. These maps were generated from GPS data taken along the trail. The trail changes slightly every year, but this is great stuff.
Check it out at http://www.dnr.state.ak.us/mlw/iditarod/maps.htm .
Eric
PS The files are large - up to 15 MB
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