The collection contains records of Clyde Iron Company (1889), Northwestern Supply Company (1899), Northwestern Manufacturing Company (1899), Clyde Iron Works, Cleveland Duluth Company, Inc. (1920), Willamette Clyde Company (Oregon, 1923), Cleveland Duluth Holding Company of Minnesota (1926) and Clyde Iron Works Sales Company (renamed Clyde Sales Company) the sole distributor for Clyde Iron Works. There are no records of the Clyde Equipment Company.

The collection contains correspondence, diaries, articles and addresses written by Darling, a subject file, personal financial materials, news clippings, photographs, and engineering plans.

The collection consists of the Commission's files incuding: application to the American Revolution Bicentennial Commission to become a bicentennial city, articles of incorporation and by-laws, financial records, correspondence, manuscripts on local history that were published in the book Duluth: Sketches of the Past, project files by month, Voyageurs Canoe Trip reenactment files, news clippings, brochures and programs, photographs, and proposals.

The collection contains articles of incorporation, by-laws, minutes, annual reports, budgets, policies, newsletters, newspaper clippings scrapbooks, photographs, Chisholm family genealogy and photographs, museum programming materials and photographs, American Alliance of Museums museum assessment, strategic plan.

The collection contains minutes, financial books, annual reports, publications, maps, miscellaneous correspondence, news clippings, photographs, timetables, and microfilmed scrapbooks. Financial records represent the largest portion of records, and there is a significant lack of executive records.

The collection contains scrapbooks, news clippings, membership card file, reminiscences, financial and legal materials, photographs, and reference materials.

The collection contains corporate and financial records and minutes; job site and construction records; publicity records; and oversized photos and blueprints.