Topographic map of the Yellowstone National Park, Wyoming-Montana-Idaho /
Geological Survey (U.S.)
Marshall, R. B.
Davis, E. P.
[Washington, D.C.] : Engraved and printed by the U.S. Geological Survey,
1912
Relief shown by contours and spot heights
Contour interval 100 feet.  Datum is mean sea level.
Includes examples of "Conventional signs" used on the map in the upper right margin.