1907. Cooley, George Washington, Neal, Walter J., and Minnesota. State Highway Commission. Cartographic Details: Scale [1:1,520,640] (W 97‚Å∞00 π--W 89‚Å∞30 π/N 49‚Å∞30 π--N 43‚Å∞15 π)."January, 1907."Prime meridians: Greenwich and Washin... State Highway Commission of Minnesota (St. Paul, Minnesota).