SUBSIDIARIES OF MDU RESOURCES GROUP, INC. December 31, 1995 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 Customer One, Inc. Delaware Fidelity Oil Co. Delaware Fidelity Oil Holdings, Inc. Delaware Prairie Propane, Inc. Delaware Knife River Coal Mining Company Minnesota Knife River Hawaii, Inc. Delaware Knife River Marine, Inc. Delaware KRC Aggregate, Inc. Delaware KRC Holdings, Inc. Delaware LTM, Incorporated Oregon Pompano Marine Chartering, Inc. Florida Prairielands Energy Marketing, Inc. Delaware Rogue Aggregates, Inc. Oregon WBI Canadian Pipeline, Ltd. Canada Williston Basin Interstate Pipeline Company Delaware