Series Number Id: UNKNOWN. Sheet number: 5A. Edition number: 2. Second Army Corps and administrative areas before the Third Battle of Ypres, 1917. "Ordnance Survey, December 1916." Grey and blue administrative base map, with black manuscript ink additions showing Front Line with VIII, II, X, IX and II ANZAC Corps areas, together with other areas in red, not necessarily coinciding with black corps areas, designated by Roman numerals and a combination of Roman numerals and Latin letters. Manuscript note in margin and on reverse: P.A. 20/6/17., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC21; envelope_number: 660.