Railroad commissioners' map of Minnesota, 1930 / prepared under the direction of the commission ; compiled and published by McGill-Warner Co.Minnesota. Office of Railroad Commissionersc1930."Congressional districts are outlined and numbered in purple."Includes color key showing "Mileage operated by steam railroads Dec. 31, 1929," "Terminal and transfer railways," and "Location of depots in St. Paul, Minneapolis and Duluth and railroads using the same depots."cartographic