Middle Search Plus Middle Search® Plus contains full text for nearly 150 popular, middle school magazines. All full text articles are assigned a reading level indicator (Lexiles). Full text is also available for thousands of biographies, historical essays and student pamphlets. Additionally, Middle Search Plus contains primary source documents including Essential Documents in American History, reference books including the Funk & Wagnall's New World Encyclopedia and American Heritage® Dictionary, 4th Edition from Houghton Mifflin, the Encyclopedia of Animals™, and an Image Collection of 107,135 photos, maps and flags. Middle Search Plus also includes the Our States reference book series from Great Neck Publishing, a new collection made up of 54 titles on each of the states, commonwealths and territories in the United States. This comprehensive series has carefully-written, in-depth articles covering each state’s history, averaging 10 pages in length, and includes information on the economy, geography, natural resources, wildlife, state flags and landmarks.