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World war I : why they fought
by Rebecca Rissman Compass Point Books, 2016 書
World war I
Aaron Jolly and Rjurik Davidson Sachse, 2017 書
H.P. Willmott Dorling Kindersley , 2008 書
The World Wars
Paul Dowswell, Ruth Brocklehurst, Henry Brook 1st ed.. Usborne, 2007 書
