Rogers, H. D. 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. D. Van Nostrand, 192 Broadway.
Chicago-Zitierstil (17. Ausg.)Rogers, Henry Darwin. 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. New York: D. Van Nostrand, 192 Broadway.
MLA-Zitierstil (9. Ausg.)Rogers, Henry Darwin. 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. D. Van Nostrand, 192 Broadway.