http://www.rssboard.org/rss-specification 720 XTF Search Results (f3-subject=Directories;f4-subject=Airports -- Mexico -- Directories) http://catalog.wrhs.org/collections/search?f3-subject%3DDirectories;f4-subject%3DAirports%20--%20Mexico%20--%20Directories Results for your query: f3-subject=Directories;f4-subject=Airports -- Mexico -- Directories Thu, 01 Jan 1970 12:00:00 GMT Airports and established landing fields in the United States. http://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc http://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc Thu, 01 Jan 1970 12:00:00 GMT