The David Richards Collection on N.E. Hansen documents the extensive horticultural work and plant exploration of Niels Ebbesen Hansen (1866–1950), a pioneering plant breeder and professor of horticulture at South Dakota State College. Hansen was known for introducing hardy fruits, ornamental plants, and forage crops suitable for the Northern Great Plains. David Richards, a long-time admirer of Hansen, frequently visited him in his office. Following Hansen’s death in 1950, Richards received permission to preserve several items and salvaged numerous documents otherwise destined for disposal. These materials form the basis of this archival collection.

The collection includes Hansen’s bulletins and circulars for the South Dakota Agricultural Experiment Station, manuscripts and article drafts containing his handwritten notes and corrections, and correspondence with colleagues, friends, and customers interested in plant orders. Also present are catalog descriptions prepared for seed catalogs, transplanting cards documenting the propagation of hybrids, and research reports to the Agricultural Experiment Station and South Dakota State Horticultural Society. Additional materials include clippings, photographs, collected Russian publications, travel notes, international journals, seed catalogs, and multiple volumes of Seeds and Plants Imported from the U.S. Department of Agriculture. Subjects covered in Hansen’s writings span apples, crabapples, apricots, cherries, currants, grapes, pears, plums, roses, alfalfa, trees, and topics in plant genetics and breeding.