Alpine clover growing in the Rocky Mountains of Colorado. A match is included to represent scale.

Petalostemum purpureum at Garrison Reach on the Missouri River in North Dakota.

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 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.

Field research notebook of N.E. Hansen. Alfalfa, grasses, corn, flax, wheat, millet, sorghum and clover plats planted 1906. Some plats identified as being in Highmore, South Dakota. The notebook mentions plats that were taken from prairie land. Handwritten.