Surface Water Supply of the United States, 1927. Part V. Hudson Bay and Upper Mississippi River Basins. Nathan C. Grover, Chief Hydraulic Engineer, W.A. Lamb, S.B. Soule, J.B. Spiegel, H.E. Grosbach, and H.C. Beckman, District Engineers. [U.S. Geological Survey Water-Supply Paper 645].
