Great Britain. War Office. General Staff. Geographical Section. G.S.G.S. no. 1522a. Relief shown by form lines and spot heights. Some sheets from this set were revised and issued by War Office. Geographical Section. General Staff, published as G.S.G.S. no. 1522, 1522a. Series covers Mesopotamia and eastern Anatolian parts of Ottoman Empire. "Compiled for the Geographical Section, General Staff, by Lieut. Colonel F.R. Maunsell, C.M.G. [from] surveys in Lower Mesopotamia by Sir W. Willcoks, 1909-11, Survey of the river Tigris, Busra to Baghdad, No. 4,700 I. Simla,1909, Journey from Baghdad to Kerbela & Nejef, Capt. H. Smyth I.A., 1903.".
