But here's another book that provides the kind of concrete proof of the anecdotal evidence provided by 'Guest' etc., that you seek, and very well written it is, too:

Liz Curtis. "Nothing but the same old story - the roots of anti-Irish racism" Published by Sasta. Belfast:1996. (ISBN: 1-901005-00-3)

and another that you may find interesting (but more related to N.Ireland from the 20s to 1960s):

Ultach."The Orange Terror - the Partition of Ireland" Ard Righ Press: Belfast, 1998 (no ISBN given)