Collection, circa 1900-circa 1959, of Robert C. Matson, a professor of mining and civil engineering at the Michigan College of Mines (now Michigan Technological University) in Houghton, Michigan. Includes several research volumes containing lists of mines with sources of information, facilities reports from the Sault St. Marie and Houghton campuses for the College, and correspondence.

Collection, 1881-2018, of the Seaman family, the majority created by Arthur Edmund Seaman and Wyllys Arthur Seaman. Includes correspondence to and from the Seamans, publications by the Seamans, poetry by A. E. Seaman, research notes on various topics and miscellaneous ephemera.

Articles and letters for Reverend Stephen Polkinghorne, the father of Wilfrid C. Polkinghorne; newspaper articles, letters, pictures, and awards for Wilfrid C. Polkinghorne.