Bibliography of British and Irish History

From the product website, The Bibliography of British and Irish History provides bibliographic data on historical writing dealing with the British Isles, and with the British Empire and Commonwealth, during all periods for which written documentation is available - from 55BC to the present. It is the successor to the Royal Historical Society Bibliography of British and Irish History, available online from 2002 to 2009. The complete database now contains nearly 540,000 records, and is updated three times a year, usually in February, June and October.