First World War c 1914 to c 1918 (World War One period) 23 General and world history 7 European history 6 20th century history: c 1900 to c 2000 4 20th century, c 1900 to c 1999 3 Austro-Hungarian Empire 3 History 3 History and Archaeology 3 Military history 3 Slovenia 3 Fiction in translation 2 First World War fiction 2 History of architecture 2 Italy 2 Local history 2 Media studies 2 Medicine 2 Regional & national history 2 Social & cultural history 2 "soft" modernism theory 1 Aerial photography 1 Alternative History 1 Asian history 1 Australasian and Pacific history 1 Biography, Literature and Literary studies 1 British & Irish history 1 Conservation, restoration & care of artworks 1 Conservation, restoration and care of artworks 1 Early 20th century c 1900 to c 1950 1