Mainly correspondence, business receipts, and bank statements dealing with Nielsen's various business enterprises during 1895-1915. Companies represented here include A.J. Knollin and Co. of Missouri; partnerships with E.J. Kearnes and B.R. Meek in sheep, land and livestock operations in Utah and Idaho; the Blue Creek Land and Livestock Company of Utah; the Riverdale Ranch near Preston, Idaho; and the Pacific Reclamation Company of Metropolis, Nevada.