1. Field guidebook of Appalachian geology : Pittsburgh to New York Author/Creator: Pittsburgh Geological Society Publication/Creation: New York : [publisher not identified], 1955 Resource Type: Book Access & Availability: Loading
2. Fifth annual report of the Geological Survey of Pennsylvania Author/Creator: Geological Survey of Pennsylvania Publication/Creation: Harrisburg [Pa.] : J.S. Wallace, printer, 1841 Resource Type: Book Access & Availability: Loading
3. Fifth annual report of the Geological Survey of Pennsylvania Author/Creator: Geological Survey of Pennsylvania Publication/Creation: Harrisburg [Pa.] : J.S. Wallace, printer, 1841 Resource Type: Book Access & Availability: Loading
4. Final report ordered by Legislature, 1891. : A general index of the Final summary report of the geology of Pennsylvania Author/Creator: Geological Survey of Pennsylvania Publication/Creation: Harrisburg : Pub. by the Board of Commissioners for the Second Geological Survey, 1895 Resource Type: Book Access & Availability: Loading
5. Final report ordered by Legislature, 1891. : A summary description of the geology of Pennsylvania, in three volumes, with a new geological map of the state, a map and list of bituminous mines ... Author/Creator: Geological Survey of Pennsylvania Publication/Creation: Harrisburg : Published by the Board of commissioners for the Geological survey, 1892-95. Resource Type: Book Access & Availability: Loading
6. Fourth annual report on the geological survey of the state of Pennsylvania Author/Creator: Geological Survey of Pennsylvania Publication/Creation: Harrisburg [Pa.] : Holbrook, Henlock & Bratton, printers, 1840 Resource Type: Book Access & Availability: Loading
7. Fourth annual report on the geological survey of the state of Pennsylvania Author/Creator: Geological Survey of Pennsylvania Publication/Creation: Harrisburg [Pa.] : Holbrook, Henlock & Bratton, printers, 1840 Resource Type: Book Access & Availability: Loading