Properties and uses of shales and clays, southwestern Pennsylvania / by Bernard J. O’Neill, Jr., and John H. BarnesO’Neill, Bernard J., 1920- · First published 1979Open the Tome
Properties and uses of shales and clays, south-central Pennsylvania / by Bernard J. O’Neill, Jr., and John H. BarnesO’Neill, Bernard J., 1920- · First published 1981Open the Tome
