CD-R (copied 1 July 2010) containing aerial photographs (.jpeg format) and descriptive text files (.doc format) for promontory fort sites in Ulster. Files are organised by county (Antrim, Derry, Donegal, and Down).

CD-R containing 14 aerial photographs taken by Markus Casey of promontory fort sites in County Dublin (copied 4 March 2009, .jpeg format) and 1 Word document containing descriptive text for promontory fort sites in County Mayo (copied 19 January 2010, .doc format).

CD-Rs containing photograph and text description files for historic promontory fort sites compiled by Markus Casey.

CD-R containing .tiff scans of the original Ordnance Survey maps of Wicklow, sheets 26 through 47.

CD-R containing .tiff scans of the original Ordnance Survey maps of Wicklow, sheets 1 through 25.

CD-R containing .tiff scans of the original Ordnance Survey maps of Sligo, sheets 22 through 47.

CD-R containing .tiff scans of the original Ordnance Survey maps of Sligo, sheets 1 through 21.

CD-R containing .tiff scans of the original Ordnance Survey maps of Roscommon, sheets 25 through 56.

CD-R containing .tiff scans of the original Ordnance Survey maps of Roscommon, sheets 1 through 24.

CD-R containing .tiff scans of the original Ordnance Survey maps of Mayo, sheets 76 through 100.