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Historical data Objectives of project Acknowledgments ... 4 Geology .4 General features .4 Stratigraphy .4 Sulfide deposits 5 General Characteristics  .5 Sulfides in the Galena, Decorah, and Flatteville formations .... 5 Sullides in the St. Feter sandstone. 5 Sulfides in the Frairie du Chien group 5 Sullides in the Trempealeau and Franconia formations  5 Fage Exploratory work by the Geological Survey 6 Problems of drilling . 6 Diamond drilling 6 Churn drilling 6 Results  6 Crow Branch area  8 Leix property. ....  9 Farmiey Harris property . .... 9 Spitzbarth property. .... . . . . 9 Kennedy mine property  .9 James mine area  11 Meekers Grove area.  11 Vinegar Hill roaster property... 12 Conclusions .12 Selected bibliography 16 Descriptive records of drill holes ... ... 17

Exploratory drilling in the Prairie du Chien Group of the Wisconsin zinc-lead district by the U.S. Geological Survey in 1949-1950