Note in Irish from Leon Ó Mórcáin to Robinson enclosing an annotated photocopied map covering the boundaries of Cill Briocáin (Teorainn Cill Briocáin). Undated 2pp;
Typed letter from D O'Sullivan, Chief Superintendent of the Ordnance Survey to Robinson enclosing the National Grid Factors for the area marked on his index map. Encloses a grid map and a list of grid factors. (10 Dec 1986) 3pp;
Handwritten letter from Pádraig Audley to Robinson enclosing a photocopied grid map, on which he has outlined the boundary of Knock-Spiddal Parish to the west of the Crimlin River. He explains a boundary between the East and West sides of the parish, and lists the townlands in the Tully half parish. (12 Aug 1987) 3pp;
Handwritten letter from Francis [ ] to Robinson referring to photocopies of maps he has enclosed with the letter (not included). (19 Jun 1990) 1p;
Correspondence between Professor Brian McNicholl and Robinson, beginning with a handwritten letter from McNicholl who is contacting Robinson about a town called Pontoy or Pomoy which appears on historic maps he has seen, but which he cannot identify. Copy reply from Robinson who has wondered about the same placename, but has not established its modern name. He asks if it is possible to obtain photographs of these sections of the maps. A reply from McNicholl discusses the matter further, and encloses photographs of sections taken from the following historic maps. Baptista Boazio's Map of Ireland (1599), O'Donovan's map of Connemara, John Speede's map of the Province of Connaught (1610), Ortelius Map of Ireland (1573), Mercator Map of Ireland (1595). (1990) 5pp and 6 photographs;
Correspondence between Michael Gibbons and Robinson, including some third party correspondence and enclosures. A note enclosing a photocopied article by Jane Conroy 'Galway Bay, Louis XIV's navy and the "little bougard"' (published 1997). The article describes and shows French hydrographical charts of Galway Bay and Aran. A third party letter from John Andrews to Gibbons comments on the Zalterius map and its similarity to the version of Ireland in Mercator's map of Europe. Subsequent correspondence between Gibbons and Robinson on the subject. (c1998-2003) 17pp;