Topographic Map - Yellowstone

http://www.yellowstonenationalpark.com/topomap.htm

 

This is a topographic map with contour lines of equal elevation.  The shading displays the relief of the Yellowstone area.  The interactive feature of this particular map lets you zoom in on an area to get a detailed view of the topography.  This could be useful for a serious hiker who is trying to determine the steepness of his or her route.