The geology of Centre County . Appendix A. Extracts from report to Lyon, Shorb & Co., . Appendix B. Observations on the geological formations

Name: The geology of Centre County . Appendix A. Extracts from report to Lyon, Shorb & Co., . Appendix B. Observations on the geological formations
Author: D'Invilliers, E. V., Lesley, J. P., Ewing, A. L., Geological Survey of Pennsylvania, Pennsylvania. Board of Commissioners for the Second Geological Survey