The geology of the South Mountain belt of Berks County. - D'Invilliers, Edward Vincent, 1857- (Harrisburg, Board of Commissioners for the Second Geological Survey, 1883)
"Illustrated ... by the maps in the Atlas to D3 [v. 1: The pageppy of Lehigh and Northampton Counties issued by the Pennsylvania State Geologist (1874-1890)]"
Appendix: Indians of Berks County.
Keywords: Geology -- Pennsylvania -- Berks County; Indians of North America -- Pennsylvania