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While teaching and lecturing during the 1960s, Liddle began collecting historical memorabilia in order to bring history to life for students. He founded the Liddle Collection which he continued to build for the next 30 years. The Liddle Collection was made up of personal experience documentation and memorabilia connected to the First World War. The collection is permanently housed at the University of Leeds.
Liddle's publications include: "1916 Battle of the Somme", "Facing Armageddon: The First World War Experienced", "The Great War 1914-1945: Lightning Strikes Twice" and "For Five Shillings a Day: Experiencing War 1939
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