prepared from surveys by the Wisconsin Geological and Natural History Survey, E. A. Birge, PH.D., director ; Survey in charge of C. Dwight Marsh ; Survey by C. Dwight Marsh and E. F. Chandler ..
prepared from surveys by the Wisconsin Geological and Natural History Survey. E.A. Birge, PH. D., Director. Hydrography in charge of L.S. Smith, C.E. Field work by L.S. Smith & H.M. Trippe ..
prepared from surveys by the Wisconsin Geological and Natural History Survey E.A. Birge, PH. D. director. Hydrography in charge of L.S. Smith, C.E. Field work by L.S. Smith & H.M. Trippe