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1915–16 Northern Rugby Football Union Wartime Emergency League season1916–17 Northern Rugby Football Union Wartime Emergency League season1917–18 Northern Rugby Football Union Wartime Emergency League season1918–19 (January) Northern Rugby Football Union Wartime Emergency League season1941–42 Northern Rugby Football League Wartime Emergency League season1943–44 Northern Rugby Football League Wartime Emergency League season1944–45 Northern Rugby Football League Wartime Emergency League season