Conventional signs & styles of type etc. : Gauging & type to be used on the sheets of the Map of Africa - Scale 1:250 000 ,
Great Britain.War Office.Intelligence Division.
Great Britain.War Office.General Staff.Geographical Section.
[London] : [War Office, Intelligence Division],
1900.
Symbology to be used for African series at 1:250,000 , including IDWO 1479 and IDWO 1489. See also TSGS 1956.