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The N.E. Hansen papers represent a comprehensive archive chronicling the career of Niels Ebbesen Hansen. The collection encompasses a diverse range of materials, including authored articles, bulletins, and circulars from Hansen's tenure at the South Dakota Experiment Station, as well as field notebooks, and ledgers from the South Dakota Horticultural Society.

Contributions from Helen Hansen Loen, Hansen's granddaughter, further enrich the collection with addresses, correspondence, journals, and travel documents, offering a deeper understanding of his professional and personal life. Notable highlights include addresses delivered by Hansen at prestigious events like the International Congress of Genetics in Berlin, underscoring his scholarly impact.

The collection's breadth extends to reports on forestry, sheep, and forage crops, reflecting Hansen's diverse interests. Manuscripts delve into topics ranging from agricultural practices to fine arts, while photographs document Hansen's expeditions to Siberia and Northern China, providing visual context to his exploratory work. Of particular significance are Hansen's manuscripts examining Soviet Russia's socio-political and economic landscape from 1934 to 1937. These writings offer valuable insights into agricultural collectivization, industrialization, and societal dynamics during that period, complementing Hansen's broader contributions to agricultural science.

Field research notebook of N.E. Hansen. Alfalfa and clover plats planted July 20, 1907. Varieties studied originated from Norway, Turkistan, Russia, Siberia, Sweden, Lapland, and South America. Handwritten

Field research notebook of N. E. Hansen. Alfalfa and clover grasses planted May 1908. Varieties studied originated from Norway, Turkistan, Russia, Siberia, Sweden, Lapland, and South America. Several varieties came from the Moscow Agricultural College (Moscow Timiryazev Agricultural Academy).

Research notebook for N.E. Hansen's experiments with alfalfa, which were conducted throughout South Dakota in 1913. Places include Faith, Ipswich, Isabel, Kadoka, Lemmon, Miller, Mobridge, Pierre, Vivian, and Winner. Varieties studied include Samara, Cossack, Cherno, and Semipalatinsk.

Research notebook for N.E. Hansen's experiments with alfalfa for 1911, with notes regarding 1909 and 1910 experiments. Varieties studied include Omsk, Cossack, Samara, North Sweden, Obb Siberia, and Cherno.

N.E Hansen's research notebook regarding field experiments for grasses and grains in 1888 and 1889. The field consisted of 66 plots. He studied 92 varieties in total including: 22 grasses, 9 clovers, 20 wheats, 23 oats, 14 barleys, 1 rye. Hansen was assisted by John M. Aldrich, Alvah George Cross, and J.G. Ross.

Research notebook for N.E. Hansen's experiments with grasses, clovers, and forage that were conducted near the Hunter Salzer Farm by Mellet, South Dakota in 1897 with remarks about 1896. The first part of the notebook discusses his experiments on 38 plots, which included numerous varieties of grasses, oats, wheat, alfalfa, clovers, and corn. The notebook also details his research on an additional 64 plots of grasses and forage plants. The notes include his assessments of the varieties and comments regarding the weather.

South Dakota Agricultural Experiment Station field research notebook of N.E. Hansen. Research on varieties of soybeans, alfalfa, and kochia were conducted in Highmore, SD and Brookings, SD during 1943. Handwritten.