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Dennis L. Haider succeeded the retiring R.J. White as president of Prairielands Energy Marketing, Inc. Haider moved over from v.p.-operations for the Williston Basin Interstate Pipeline Co., another unit of MDU Resources Group Inc. Prairielands became a subsidiary of Williston Basin when Haider took over as president.
In a related development, Ronald G. Skarphol, a special projects manager of Montana-Dakota Utilities Co., takes White's place as v.p.-marketing and business development. Montana-Dakota is another MDU division.