SUBSIDIARIES OF MDU RESOURCES GROUP, INC. December 31, 1994 State or Other Jurisdiction in Which Incorporated Alaska Basic Industries, Inc. Alaska Anchorage Sand and Gravel Company, Inc. Alaska Centennial Energy Holdings, Inc. Delaware Concrete, Inc. California Fidelity Oil Co. Delaware Fidelity Oil Holdings, Inc. Delaware Gwinner Propane, Inc. Delaware Knife River Coal Mining Company Minnesota KRC Aggregate, Inc. Delaware KRC Holdings, Inc. Delaware LTM, Incorporated Oregon Prairielands Energy Marketing, Inc. Delaware Rogue Aggregates, Inc. Oregon WBI Canadian Pipeline, Ltd. Canada Williston Basin Interstate Pipeline Company Delaware