Collection consists of Elisha V. and Boaz W. Long's personal, legal, and dipolmatic correspondence; legal and business records; manuscripts and reports; clippings; and family papers. A large portion of the collection consists of: the legal papers of Elisha V. Long during his tenure as district attorney for several New Mexico counties (1896-1899), as the Chief Justice of the New Mexico Territorial Supreme Court (1885- 1890), and as a private attorney; and the official papers of Boaz W. Long during his tenure as U.S. Ambassador to various Central American and Carribean countries (1920s-1940s). Extensive correspondence between Elisha and Boaz span the years 1881 to 1925. Business records include account books and family papers include Boaz's diaries (1894-1968). Noted subjects are: the Anton Chico, Las Vegas, Maxwell, Mora, Los Trigos, Pablo Montoya, and Pablo Melendres land grants; the New Mexico Constitution; the Mexican Revolution; Mexican Telephone and Telegraph (1910-1931); the National Recovery Administration (1933-1936); and World War II.

Some materials are in Spanish.