The papers of the Idaho Alpha chapter span the years 1921 to 1980.

The material includes correspondence, both incoming and outgoing, relating to membership, initiations, and other society matters, several editions of the local chapter by-laws, including material relating to the by-law controversy of 1941-1942, lists of members and also lists of those juniors and seniors considered for membership, and minutes of meetings from 1926-1936 and 1958-1959, as well as minutes and other material relating to the Alpha Society. The financial records include the annual report to the United Chapters, key orders, bank statements, canceled checks, and invoices, mostly from the United Chapters. There are photographs of Members in Course for 1955 and 1961, and some Phi Beta Kappa publications, addresses, and delegate manuals for conferences.