ncludes index map and 16 stratigraphic columns showing coal measurements. Plate LXVII. "Troy. Tell City." Detached from: Seventh annual report of the Geological Survey of Indiana, made in the year 1875. Indianapolis : Sentinel Company, 1876. Page 1280.
Imprint: [Indianapolis] : [Sentinel Company, printers], [1876]; Imprint: [Indianapolis] : [Geological Survey of Indiana], [1876]
Dimensions: on sheet 21 x 26 cm