Ordnance Survey letters Mayo : letters relating to the antiquities of the County of Mayo, containing information collected during the progress of the Ordnance Survey in 1838 /
O'Donovan, John,1809-1861.
O'Conor, Thomas.
O'Keeffe, P.(Patrick)
Herity, Michael.
Dublin : Four Masters Press,
2009.
Includes bibliographical references and index.
Ordnance Survey of Ireland