Workers cutting timber into logs, ca. 1900.

Lumberjacks rolling a log. Oil-on-board painting by an anonymous artist, ca. 1900.

Drain-tile ditching machine. Photograph by Joseph Zalusky, ca. 1916.

Taconite stockpile, Silver Bay. Photograph by Walter H. Wettschreck, ca. 1965.

Mississippi River and dam, Little Falls, ca. 1890.

Lake Itasca, early 1980s. Photograph by Stephen R. Davis.

Dam on Elk Lake, Itasca State Park, ca. 1940.

Fort Snelling. Oil-on-canvas painting by Alexis Jean Fournier, 1888.

Aerial view of St Peter State Hospital (St. Peter, Minnesota), April 13, 1954. Photo by the Minneapolis Star Journal–Tribune.

Employees of the St. Peter State Hospital (St. Peter, Minnesota) cutting ice on the Minnesota River, next to the hospital, January 1940.