http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f313-subject=Rock-salt) http://norton.wrhs.org/collections/search?docsPerPage%3D100;f313-subject%3DRock-salt Results for your query: docsPerPage=100;f313-subject=Rock-salt Thu, 01 Jan 1970 12:00:00 GMT Silurian rock salt of Ohio. Clifford, Michael J., Ohio Division of Geological Survey. http://norton.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc http://norton.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc Thu, 01 Jan 1970 12:00:00 GMT