http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f70-subject=Earth -- Curiosa and miscellany) https://catalog.wrhs.org/collections/search?docsPerPage%3D100;f70-subject%3DEarth%20--%20Curiosa%20and%20miscellany Results for your query: docsPerPage=100;f70-subject=Earth -- Curiosa and miscellany Thu, 01 Jan 1970 12:00:00 GMT Symmes's theory of concentric spheres: demonstrating that the earth is hollow, habitable within, and widely open about the poles. McBride, James, 1788-1859, Symmes, John Cleves, 1780-1829 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