TopoZone - Yellowstone National Park
http://www.topozone.com/map.asp?z=12&n=4949995&e=534601&s=1000&size=l&u=6&datum=nad83&layer=DRG250

Maps a la carte, Inc.


This website contains U.S. Geological Survey digital topographic maps for Yellowstone National Park and the rest of the United States. Maps are available in numerous series, and may be viewed at various scales and in UTM, decimal degrees, degrees/minutes/seconds, and degree/decimal minutes coordinate formats.

This resource is referenced here:
Subject: Geoscience:Geology:Igneous and Metamorphic Petrology:Volcanology
Resource Type: Audio/Visual:Maps
Topics: Earth surface
Focus on Yellowstone: Surficial geology and hydrology