Ibiza & Formentera [cartographic material].Great Britain. War Office. General Staff. Geographical Section1943"Contour interval 50 metres.""N3835-E109 / 35x34."Five classes of roads and paths, and wooded and intensely culivated areas are shown.In upper margin: Balearic islands 1:100,000 ...Insets: Index to adjoining sheets and incidence of grid letters--Reliacartographic