Imperial War Museum
Lives of the First World War
Operation War Diary

Regiments in WW1
Remembrance - The Yorkshire Regiment (Green Howards)
The Prince of Wales's Own Regiment of Yorkshire - West Yorks and East Yorks

Bradford
Bradford World War One Group 
Bradford Roll of Honour
Bradford Pals
ShipleyWW1- Shipley Times and Express
WW1 Saltaire Story
Men of Worth - Keighley and Worth Vally WW1
Calverley Pudsey Farsley Idle Greengates Stanningley War Memorial names

Leeds
Legacies of War - Leeds University

Health
Military nurses - Scarletfinders
2nd Northern General Hospital, Becketts Park, Leeds

Peace
Choices Then and Now The Peace Museum Bradford
Conscientious Objectors Archive and Educational Resource - Peace Pledge Union

Archives
National Archives WW1
British Library WW1
West Yorkshire Archive Service
Bradford Local Studies Library WW1 resources