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 ; field work by L.S. Smith and H.M. Trippe