http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f18-subject=Navigation (Aeronautics) -- United States) https://catalog.wrhs.org/collections/search?docsPerPage%3D100;f18-subject%3DNavigation%20(Aeronautics)%20--%20United%20States Results for your query: docsPerPage=100;f18-subject=Navigation (Aeronautics) -- United States Thu, 01 Jan 1970 12:00:00 GMT Inspecting the airways: Federal Aviation Agency. United States Federal Aviation Administration. 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