MAS Ultra - School Edition This comprehensive database, designed specifically for high school libraries, contains full text for nearly 500 popular, high school magazines. All full text articles are assigned a reading level indicator (Lexiles). Full text is also available for 85,670 biographies and over 107,000 primary source documents. Additionally, MAS Ultra – School Edition contains more than 360 reference books (including the Columbia Encyclopedia, the CIA World Fact Book and World Almanac & Book of Facts), an Image Collection of over 510,000 photos, maps & flags, color PDFs and expanded full text backfiles (back to 1975) for key magazines.