http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f21-subject=Mines and mineral resources -- Ohio -- Bibliography) https://catalog.wrhs.org/collections/search?docsPerPage%3D100;f21-subject%3DMines%20and%20mineral%20resources%20--%20Ohio%20--%20Bibliography Results for your query: docsPerPage=100;f21-subject=Mines and mineral resources -- Ohio -- Bibliography Thu, 01 Jan 1970 12:00:00 GMT Reports and maps on the geology and mineral resources of Ohio, May 1947. Geological Survey of Ohio 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