Simon Chadwick's
Early Gaelic Harp Emporium

Early Music journal

Early Music, vol 36 no.4, November 2008
Oxford University Press
Includes an 11 page article The Early Irish Harp by Simon Chadwick, covering terminology, extant instruments, repertory & playing techniques and illustrated with colour and b/w photographs of some of the extant instruments. The cover of the issue shows the medieval 'Trinity College' harp. An ideal overview of the subject.
£18 + £2.50 (UK only - select for overseas postage) £4.00 (Airmail within Europe) £6.00 (Airmail outside Europe)

Earlier back issues are often available secondhand (updated May 2010):

Ann Buckley (ed.)
Early Music of Ireland
Early Music Vol 28 No.2, May 2000
This issue of the scholarly journal "Early Music", guest edited by Ann Buckley, contains a number of interesting articles providing some useful background information. As well as an illustrated overview of medieval music and musicians by Ann herself, there are a number of articles on medieval and later church singing, and an interesting articleby the American group Altramar on their reconstructions as recorded on 'Crossroads of the Celts'. There is nothing specifically on Gaelic harps, save passing mentions in some of the articles, but there is much to interest anyone interested in early Irish music. Sold.

Early Music Vol 15 No.4, November 1987
includes a letter from Layton Ring on William Lawes. £12 Sold

Early Music Vol 15 No.2, May 1987
Subtitled 'Plucked Strings', this issue includes articles by Christine Bordas (Spanish double harps), Joan Rimmer (Carolan's music), Mike Billinge and Bonnie Shaljean (the Cloyne harp), and Peter Holman (William Lawes and Cormack MacDermott). Sold

Early Music Vol 8 No.4, October 1980
letters on Arpa Doppia and bray pins. £12 Sold

Early Music Vol 8 No.1, January 1980
Robert Hadaway on building an Arpa Doppia. £12.

Early Music Vol 8, 1987
4 vols in 1, includes Robert Hadaway on building an Arpa Doppia, and subsequent correspondence on the Arpa Doppia and bray pins. £22

Early Music Vol 7 No.4, October 1979
Michael Morrow's article on Renaissance harp traditions. £12.