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MDU RESOURCES G ROUP, INC.

It takes more than 22,000 pounds of stone, sand and gravel per

person each year in the United States to build and maintain roads,

sidewalks, building foundations and other key parts of the nation's

building and transportation infrastructure. And the need is growing --

demand for aggregates is expected to increase 14 percent to

20 percent by 2020. Knife River Corporation is a leader in the

construction

materials

construction materials and contracting