http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f39-subject=Twilight) http://norton.wrhs.org/collections/search?docsPerPage%3D100;f39-subject%3DTwilight Results for your query: docsPerPage=100;f39-subject=Twilight Thu, 01 Jan 1970 12:00:00 GMT Tables of sunrise, sunset, and twilight. United States Naval Observatory Nautical Almanac Office., United States Naval Observatory Nautical Almanac Office. 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