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Sources:
http://www.spartacus.schoolnet.co.uk/BUharmsworth.htm">http://www.spartacus.schoolnet.co.uk/BUharmsworth.htm 
http://www.newworldencyclopedia.org/entry/Daily_Mirror 
http://www.nationalmediamuseum.org.uk/exhibition/extraextra/DailyHeraldHistory.pdf
http://www.newworldencyclopedia.org/entry/Lord_Rothermere 
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http://uk.encarta.msn.com/encyclopedia_761554279/Harmsworth_Alfred_Charles_William_Viscount_Northcliffe.html