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A. C. Lane A. G. Ruthven abandoned act number agricultural analyses Annual Report anticline biological Board of Geological Bound in paper brine cement character Chief Naturalist clay co-operation College Commission Compassman copper deep borings distribution district drainage drilling duty economic Explorations and records field Figs formations four thousand six Geological Series Geological Survey Geological Geologist glacial gypsum Huron Huronian industry Inspector investigation iron bearing Iron River Isle Royale Junior Topographer Lake Gogebic lands limestone Mackinac Island Marquette Menominee Michi Mineral Statistics mineral waters oil and gas oil shale operator Palaeozoic peat plat plugging Porcupine Mountains Public Library R. A. Smith R. C. Allen region River rocks Rodman Rominger Saginaw salt sand sandstone SECTION shales shore soil survey statistical tables stratigraphy Supply house Survey Geological Survey survey of Michigan tion topographic map topographic survey United States Geological Upper Peninsula water power water supplies