168 



Economic Geology. 

 Clays. Cox, E. T., Rep. 1870. Davies, Martin, Sullivan counties; do 

 1872, Dubois, Pike, Park counties ; do. 1873 Warren county; do. Cox's 

 Rep. 1874. 



Vigo, Orange counties. 

 r8. Analyses of clays. 

 Monroe county. 



Bartholomew, Delaware, Shelby counties. 

 Clays of Indiana. 

 Rush, Grant counties. 

 Thompson, M., Rep. 1885-86. Clay of Indiana; do. Marshal county. 

 Thompson, M., Rep. 1888. Clays of Indiana (DeKalb county). 

 Kaolin, Statistics of production, 10th census U. S., p. 842, 848-849. 

 Coals. Cox, E. T., Rep. 1870. Western measures and Ind. coal. 

 Cox, E. T., Rep. 1870. Daviess, Martin, Sullivan. Notes on Knox, Du- 

 bois, Pike, Gibson, Warrick, Spencer, Perry, Posey, Vanderburg 

 counties. 

 Cox, E. T., Rep. 1872. Clay, Dubois, Pike, Jasper, White, Carroll, Cass, 



Miami, Wabash, HoM'ard, Park counties. 

 Cox, E. T., Rep. 1872. Development and analysis of coals. 

 Cox, E. T., Rep. 1872. St. Joseph county (peat). 

 Cox, E. T., Rep. 1873. Warren, Knox, Gibson counties. 

 Cox, E. T., Rep. 1875. Analyses of, from Clay, Owen, Fountain, Van- 

 derburg, Greene, Warrick, Posey, Sullivan, Daviess, Vermillion, 

 Vigo, Parke, Montgomery, Fayette, (Pa.), Macklenburg, (Ky.) Rob- 

 ertson, (Tex.) counties. 

 Collett, J., Rep. 1880. Ind. coal vs. Pittsburg coal. 

 Collett, J., Rep. 1881. Cost and increase of production. 

 Collett, J., Rep. 1881. Putnam county. 

 Collett, J., Rep. 1882. Observations on Ind. coal. 



Collett, J., Rep. 1883. Fuel values of coals, do. (Clay, Gibson counties). 

 Collett, J., Rep. 1883. Comparison of Ind. block with 111. coals. 

 Collett, J., Rep. 1883. Analysis of peat. 

 Collett, J., Rep. 1883. Stone-coals of Ind. 

 Thompson, M., Rep. 1885-86. Washington county. 

 Min. resurces of U. S. 1885, p. 11-29. 

 Owen, R. Gibson and Green counties. See Lesquereux. 

 Indiana Coal. Min. resources of U. S. 1886, pp. 228, 230, 261. 



