Digital Maps and Geospatial Data | Princeton University
Dublin (Balrothery east). Sheet 5-9
- Dublin : [s.n.], 1968.
Ireland. Ordnance Survey Office. Relief shown by spot heights and hachures. In lower left margin: "Surveyed in 1837. Revised in 1966. Levels revised in 1938." "Altitudes are referred to Ordnance Survey datum, which is a low water of spring tides observed in Dublin Bay on 8th April 1837, this datum being 8.218 feet below mean sea level.".
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