ProQuest六种历史报纸数据库
试用地址👌🏿：http://search.proquest.com/news?accountid=13151
试用截止日期🧛🏿：2016年4月15日
本次试用包含以下内容🧖🏼𓀎：
ProQuest Historical Newspapers: Chicago Tribune
ProQuest Historical Newspapers: Los Angeles Times
ProQuest Historical Newspapers: New York Tribune / Herald Tribune
ProQuest Historical Newspapers: The Guardian and The Observer
ProQuest Historical Newspapers: The New York Times with Index
ProQuest Historical Newspapers: The Washington Post