http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f4-subject=Fortification -- Pennsylvania -- Philadelphia) https://catalog.wrhs.org/collections/search?docsPerPage%3D100;f4-subject%3DFortification%20--%20Pennsylvania%20--%20Philadelphia Results for your query: docsPerPage=100;f4-subject=Fortification -- Pennsylvania -- Philadelphia Thu, 01 Jan 1970 12:00:00 GMT Plans for the construction and raising of the chevaux de frize in the Delaware River, 1775-1784. 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