Books by Delmer L. Helgeson:
Books in the extended shelves:
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Helgeson, Delmer L.: The Economic feasibility of establishing oil sunflower processing plants in North Dakota (Dept. of Agricultural Economics, North Dakota Agricultural Experiment Station, North Dakota State University, 1977), also by United States. Economic Development Administration and North Dakota State University. Dept. of Agricultural Economics (page images at HathiTrust)- Helgeson, Delmer L.: Economies of size, volume, and diversification in retail grain and farm supply businesses (University of Nebraska-Lincoln, College of Agriculture, Agricultural Experiment Station, 1974), also by Dale G. Anderson (page images at HathiTrust)
Find more by Delmer L. Helgeson at your library, or elsewhere.