AMS 1. United States. Army Map Service. Great Britain. War Office. General Staff. Geographical Section. G.S.G.S. no. 4420. Alternate title: Antwerp - Anvers - Antwerpern. Nord de Guerre Grid. Inset: Antwerp with other main towns and waterways, (1:1,000,000). Copied from a Belgian map. Photolithographed by the War Office, 1943.