MDU RESOURCES GROUP, INC. FORM 10-K FOR PERIOD ENDED 12/31/2010

Company

MDU RESOURCES GROUP INC

Filed

February 23, 2011

Period of Report

December 31, 2010

Accession Number

0000067716-11-000021

A 10-K is a company's comprehensive annual report, required by the SEC. It includes audited financial statements, a description of the business, risk factors, and management's discussion of results. Learn more about 10-K filings →