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                              _Geology of_
                              YELLOWSTONE


A review of the geologic processes and events responsible for the
spectacular natural wonders of the Yellowstone country, commemorating
the 100th anniversary of the oldest and largest of our national parks.

 For sale by the Superintendent of Documents, U.S. Government Printing
                                 Office
                   Washington, DC. 20402--Price $1.25
                         Stock Number 2401-1209

    [Illustration: "_* * * and behold! The whole country beyond was
    smoking with vapor from boiling springs, and burning with gases
    issuing from small craters, each of which was emitting a sharp,
    whistling sound. * * * The general face of the country was smooth
    and rolling, being a level plain, dotted with cone-shaped mounds. On
    the summit of these mounds we