http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f83-subject=Coal mines and mining -- Pennsylvania) https://catalog.wrhs.org/collections/search?docsPerPage%3D100;f83-subject%3DCoal%20mines%20and%20mining%20--%20Pennsylvania Results for your query: docsPerPage=100;f83-subject=Coal mines and mining -- Pennsylvania Thu, 01 Jan 1970 12:00:00 GMT Coal; its antiquity, discovery and early development in the Wyoming Valley: A paper read before the Wyoming historical and geological society, June 27, 1890. Kulp, George Brubaker, 1839- https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc Thu, 01 Jan 1970 12:00:00 GMT Mineral coal: Two lectures. Maxwell, Volney L., 1804-1873 https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc Thu, 01 Jan 1970 12:00:00 GMT Winfield Coal and Iron Company: in the county of Butler, Pennsylvania. Winfield Coal and Iron Company https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc Thu, 01 Jan 1970 12:00:00 GMT