The earth revealed : aspects of geologic mapping : catalog of the exhibition /
Ehrenberg, Ralph E.,1937-
Library of Congress.Geography and Map Division.
Washington, D.C. : Library of Congress, Geography and Map Division,
1989.
Library of Congress exhibition, Geography and Map Division Gallery, James Madison Memorial Building, July 10, 1989-January 7, 1990.
Includes bibliographical references.
Geological mapping