http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f309-subject=Air traffic control) http://norton.wrhs.org/collections/search?docsPerPage%3D100;f309-subject%3DAir%20traffic%20control Results for your query: docsPerPage=100;f309-subject=Air traffic control Thu, 01 Jan 1970 12:00:00 GMT Airports, airways, and electronics. Mehrens, Harold E., United States Civil Air Patrol. 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 Air traffic control. Butterfield, Ben., Science Service 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