The collection consists of records of District Lodge 46 (Atlanta, Ga.) of the International Association of Machinists from 1937-1965. Consists primarily of correspondence and contracts relating to union recognition and contract negotiation.

International Association of Machinists and Aerospace Workers, Local Lodge 31 (Omaha, Neb.) records (1950-2020) consists of office files, benefits information, grievances, job descriptions, collective barganing agreements, training materials, correspondence, and photographs. Local Lodge 33 represented workers in the Omaha, Nebraska area. The largest industries were the Crown Packaging factory and various over the road trucking companies.

International Association of Machinists and Aerospace Workers, District Lodge 143 represented airline workers in the Great Lakes region of North America, specifically with Northwest Airlines. The records (1946-2009) consist of bylaws, benefits and retirement information, conventions proceedings, contracts, apprenticeship materials, publications seniority lists, committee materials, financial records, artifacts, photographs, audiovisual materials, and various types of correspondence.