Map of Zeppelin raids on north-east England, 14 Apr 1915 & 15 Jun 1915.
Source: Sir Walter A. Raleigh, Henry A. Jones. The War in the Air: Being the story of the part played in the Great War by the Royal Air Force. Clarendon Press, Oxford; 1922-1937. Also see text in Vol 3, pp 104-105.

Image of map of Zeppelin raids on north-east England, 14 Apr 1915 & 15 Jun 1915.