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.

International Association of Machinists and Aerospace Workers, District Lodge 143 represented the union employees that worked for Northwest Airlines, predominantly in the Great Lakes Region of the United States. The IAMAW District Lodge 143 records (1950s-2010) consist of grievance and arbitration files, contract negotiation materials, bankruptcy proceedings, and documents regarding the merger with Delta Airlines.

The United Leather Workers International Union records, Local 18 (Minneapolis, Minn.) contain a handwritten minutes book from union meetings from 1915 to 1921; miscellaneous paperwork from members of the ULWIU Local 18, 1913-1919, undated; and a roster of local Secretary-Treasurers.