Day, Angelique & McWilliams, Patrick (Series Editors). The Ordnance Survey Memoirs of Ireland: Vol.18 Londonderry V: Maghera & Tamlaght O'Crilly. Belfast: Institute of Irish Studies. 1990s. Paperback.The OS Memoirs reveal everyday life in the northern counties of Ireland in the early part of the nineteenth century. Transcribed from the material which was intended to accompany the first Ordnance Survey maps, each contains a mass of detail about what the economy, society and landscape was like at parish level in the 1830s. IRISH