The collection consists of correspondence and property records of Hugh M. McNary, his son Hugh P. McNary, and Hugh P. McNary's cousin Charles L. McNary. The property records consist of an indenture for Hugh M. McNary from 1859, and two deeds for Hugh M. McNary from 1868. Charles L. McNary's correspondence in the collection consists of: two letters from 1920 and 1921, both addressed to someone only referred to as "Minnie," regarding social gatherings at the home of U.S. Senator Medill McCormick; a January 14, 1924, letter to Fred Langerman about the Warm Springs irrigation project; an April 17, 1933, letter to Grace C. Kantz, concerning the possible establishment of a post office at Testament Creek Junction, Oregon, with her as postmaster; and a June 26, 1936, telegram to Katherine Gabriel (written as Mrs. W. W. Gabriel) about the approval of benefit payments to flax growers. Other correspondence in the collection consists of three letters from 1931 between Hugh P. McNary and Holt R. Shaw about the 1845 Oregon Trail wagon train; a September 17, 1880, letter from George F. Cook to Hugh M. McNary, inquiring about the Blue Bucket Mine; and a July 19, 1882 letter from Samuel L. Brooks to Hugh M. McNary, about issues concerning a property identified as "the Lockwood property."