Map showing location of clay and shale pits and ceramic plants in Indiana
Base from Map of Indiana, 1950 edition, published by U.S. Geological Survey. Minor revisions and additions made from Indiana Department of Conservation, Geological Survey, county base maps.' Scale 1:1,000,000 Compiled by H.H. Murray.
Murray, Haydn H. (Haydn Herbert),1924-cartographer.
Indiana Department of Geology and Natural Resources