pt. II., cont'd. book VIII. Eighth Palaeozoic district, or anthracite coal-basins, and encircling belts of the older Carboniferous rocks. book IX. Ninth Palaeozoic district, or bituminous coal-fields and their associated older Carboniferous strata. pt. III. Mesozoic red sandstone series. pt. IV. Igneous rocks and minerals, veins and ores
![Icon image The Geology of Pennsylvania; a Government Survey. With a General View of the Geology of the United States, Essays on the Coal-formation and Its Fossils, and a Description of the Coal Fields of North America and Great Britain. (Maps.) [With Plates and Diagrams.]: Volume 4](https://books.google.com/books/content/images/frontcover/sj8Ux4VQJqQC?fife=w256-h256)
![Icon image The Geology of Pennsylvania; a Government Survey. With a General View of the Geology of the United States, Essays on the Coal-formation and Its Fossils, and a Description of the Coal Fields of North America and Great Britain. (Maps.) [With Plates and Diagrams.]: Volume 3](https://books.google.com/books/content/images/frontcover/ylpVUBB2Ck0C?fife=w256-h256)
