Irish History Online an index to Irish and Northern Irish history.
Reference works
Oxford Companion to British History DA 34 .O93 2015 Main
British Empire: a Historical Encyclopedia DA 16 .B693 2018 v. 1-2 Main
Historical Dictionary of British Foreign Policy Main DA 45 .N48 2013
Oxford Companion to English Literature PR 19 .O94 2006 Main
Historical Dictionary of the Contemporary United Kingdom DA 34 .P357 2008 Main
Encyclopedia of Britain Main DA 1 .E539 1999
Historical Dictionary of the British Monarchy Main DA 28.1 .P27 2011
Historical Dictionary of Ireland Main DA 910 .T39 2014 (covers Northern Ireland also)
Butler's British Political Facts Main JN 238 .B882 2018 Coverage from 1900 to Nov., 2017.
Oxford Dictionary of National Biography Main DA 28 .O95 2004
There are a number of subject/research guides here.
Contact the librarian
Agnes Haigh Widder, Humanities Bibliographer
Michigan State University Libraries
366 W. Circle Dr. W118FF, Mail Stop 6
East Lansing, Mich. 48824
517-884-6394
517-432-3532 fax
widder@msu.edu