Ordnance Survey of Ireland. & Yolland, W. (1847). An account of the measurement of the Lough Foyle base in Ireland: With its verification and extension by triangulation; together with the various methods of computation followed on the Ordnance survey, and the requisite tables. Printed by Palmer and Clayton, and sold by Messrs. Longman, Brown, Green and Longmans.

Ordnance Survey of Ireland. and William Yolland. An Account of the Measurement of the Lough Foyle Base in Ireland: With Its Verification and Extension by Triangulation; Together with the Various Methods of Computation Followed on the Ordnance Survey, and the Requisite Tables. Printed by Palmer and Clayton, and sold by Messrs. Longman, Brown, Green and Longmans, 1847.