The geological story of Pennsylvania / by John H. Barnes and W.D. Sevon, 2nd ed.Barnes, John Henry, 1946- · First published 1996Open the Tome
Rocks and minerals of Pennsylvania / by John H. Barnes ; illustrations by Samuel W. Berkheiser. 3rd ed., rev.Barnes, John Henry, 1946- · First published 1991Open 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
Mineralogy associated with burning anthracite deposits of eastern Pennsylvania / by Davis M. Lapham and John H. Barnes, Pennsylvania Geological Survey, Wayne F. Downey, Jr., R.E. Wright Associates, Inc. [and] Robert B. Finkelman, U.S. Geological SurveyDavis M. Lapham · First published 1980Open the Tome
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
