Map of Knox and Gibson counties [Indiana] / prepared for the 5th annual report of Prof. E.T. Cox, state geologist, 1873 ; geology by Prof. John Collett.Collett, John, 1828-18991874]."Braden & Burford Steam Lith., Inda."Detached from: Fifth annual report of the Geological Survey of Indiana / E.T. Cox. Indianapolis : Sentinel Company, printers, 1874.Relief shown by hachures.Shows cities and towns, railroads, prairie, mounds, springs, swamps, test bores, quarries, and coal outcrops.cartographic