http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f39-subject=United States -- Territorial expansion -- History -- 19th century) http://norton.wrhs.org/collections/search?docsPerPage%3D100;f39-subject%3DUnited%20States%20--%20Territorial%20expansion%20--%20History%20--%2019th%20century Results for your query: docsPerPage=100;f39-subject=United States -- Territorial expansion -- History -- 19th century Thu, 01 Jan 1970 12:00:00 GMT Zebulon Pike: Thomas Jefferson's Agent for Empire. Matthews, George R., 1950- 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