Simpson, Ian M. (1955). ‘Geological Sketch-Map of the Carboniferous Rocks of the Omagh Syncline, Northern Ireland’, fold-out b/w map
Simpson, Ian M. (1955). ‘Geological Sketch-Map of the Carboniferous Rocks of the Omagh Syncline, Northern Ireland’, fold-out b/w map, 1:63,360, 21.5 x 38cm in an extract from the Quarterly Journal of the Geological Society. V.110, pt.4, pp. 391-408. Map and text age-toned, clean and in very condition.