Blueprints, circa 1898-circa 1913, collected by Theodore Dengler, an alumnus of the Michigan Mining School in Houghton, Michigan. Dengler worked at the Atlantic, Baltic, Mohawk and Wolverine mines. Includes blueprints of machinery, buildings, and maps, mainly from the Atlantic and Baltic mines with some from the Mohawk, Wolverine, Allouez, Champion and Central mines. Also includes correspondence and other printed ephemera.

Collection of drawings by Warren H. Manning for the design of Agassiz Park in Calumet, Michigan. Manning was commissioned to design Agassiz Park as a memorial to the late president of the Calumet and Hecla Mining Company, Alexander Agassiz. Includes presentation drawings, plans for the park layout and various structures, plans for the Agassiz statue, and various area maps and plans.

Collection, 1864-1953, of Wilbert Salmi, a resident of Toivola and Hancock, Michigan.