the Duluth, South Shore and Atlantic Railway's massive ore docks at Marquette, Michigan

Not dated, but probably circa 1940. "In the land of Hiawatha" is a reference to the region, according to one definition, the Upper Peninsula of Michigan along the shore of Lake Superior, also known as Gitchee Gumee. 

The DSS&A became a part of the Canadian Pacific's Soo Line in 1960.