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
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 ..