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.