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).

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.