This very large collection includes primary materials on the activities of Campbell, his friends, associates, business partners and adversaries.  Business correspondence, company ledgers, copy books, financial reports and family letters form the bulk of the collection, which spans the period from the early 1830s to the 1920s.  (35 linear feet of manuscripts and archival records).  Microfilm copies (30 reels) available at the Campbell House.  Finding aid available here.

This collection contains letters relating to Robert Campbell’s early career as a fur trader including his 1833 Rocky Mountain journal. Personal and business letters and other business records form the bulk of the collection. The collection also contains records for two Campbell family court cases from 1864 and 1938. Campbell business records can also be found in the Sublette papers. This collection is indexed. (22 linear feet of manuscripts and archival records). Finding aid available here. See collections A0224 and A0226.

This collection from the St. Louis Circuit Court contains the records from the Hazlett K. Campbell estate case that began in 1938. The collection is made up of testimony and evidence from individuals (both legitimate and not legitimate) making claim to the Campbell estate. Primarily consists of genealogical records–birth, death and marriage certificates in addition to photographs, personal letters and other documents dating from the 1760s to the 1930s. All of these records are were submitted to the court to prove relation to the grandparents of Hazlett Campbell. (172 volumes). Finding aid available here.The St. Louis Circuit Court also contains dozens of cases pertaining to Robert Campbell business interests circa 1838–1879. Partial finding aid available here.