A signature of time and eternity : the administrative history of Indiana Dunes National Lakeshore, Indiana /

by Cockrell, Ron
Omaha : United States Department of the Interior, National Park Service, Midwest Regional Office, Office of Planning and Resource Preservation, Division of Cultural Resources Management, 1988

Bones of Agate : an administrative history of Agate Fossil Beds National Monument, Nebraska /

by Cockrell, Ron
Omaha, Neb. : Midwest Regional Office, Office of Planning Resource Preservation, Division of Cultural Resources Management, National Park Service, U.S. Dept. of the Interior, 1987