Guardian and The Observer (1791-2003) (ProQuest Historical Newspapers) This link opens in a new windowThe Guardian (1821-2003) and its sister paper, The Observer (1791-2003), both part of the ProQuest Historical Newspaper program, give readers online access to facts, firsthand accounts, and opinions of the day about the most significant and fascinating political, business, sports, literary, and entertainment events from the past two centuries.