Worthington, Edgar Barton. Surveys and maps. Maps for the north-east Africa campaign. Surveys and the land. Wright, David. 1975.
Maps are liars.
Wright, John Kirtland. Early topographical maps, their geographical and historical value as illustrated by the maps of the Harrison Collection of the American Geographical Society. Wright, John W. 1951. Reconnaissance mapping from trimetrogron air photographs in the Anglo-Egyptian Sudan. Wright, Segismund Ashford Boston.