http://www.rssboard.org/rss-specification 720 XTF Search Results (f1-subject=United States -- Biography;f2-subject=Petroleum industry and trade -- United States) http://catalog.wrhs.org/collections/search?f1-subject%3DUnited%20States%20--%20Biography;f2-subject%3DPetroleum%20industry%20and%20trade%20--%20United%20States Results for your query: f1-subject=United States -- Biography;f2-subject=Petroleum industry and trade -- United States Thu, 01 Jan 1970 12:00:00 GMT Oil City derrick. http://catalog.wrhs.org/collections/view?docId=marc/skclmarc1931704190810404.mrc http://catalog.wrhs.org/collections/view?docId=marc/skclmarc1931704190810404.mrc Thu, 01 Jan 1970 12:00:00 GMT