The collection contains correspondence, financial materials, articles, pamphlets, photographs, news clippings, sketchbooks, a tape recording, and miscellaneous reference materials. Most of the records originate from the period between 1940-1958 and document Barnes' financial interests and his involvement in the St. Lawrence Seaway project. Some personal correspondence is also included.

The collection contains correspondence, pamphlets, publications, minutes, press releases, one photograph, newspaper clippings, articles, maps and miscellaneous reference materials. The records reflect the organic history of the Association and the history of the entire Seaway movement from the establishment of the Association to its demise in 1939.

The collection contains documents from the Arrowhead Regional Development Commission, the Great Lakes Basin Commission, and the Save Lake Superior Association. Also included are Lehto’s legislative papers, subject files, and publications.

The collection contains correspondence, articles written by Pardee, notes and other reference materials. Most of the material concerns Pardee's Duluth, Minnesota civic activities, including the Great Lakes-St. Lawrence Tidewater Association correspondence (1918-1930), civic council material (1925-1928) and some correspondence and notes on "Pittsburg Plus" (1924-1927), an issue concerning unfair steel base prices.

The collection contains annual reports, 1954-1977, minutes, 1930-1977, correspondence, files by office divisions, legal materials, news clippings, publications, and photographs.

The collection contains the following documents: Remediation Action Plan, Stage I, 1992; St. Louis River Management Plan, 1994; Habitat Plan, 2002 with accompanying CD.