Richard, Burke's Peerage's online website contain subscriptions to quite a few publications:
Burke's Peerage 107th edn (2003)
Burke's Peerage Revised Families (covers quite a few families)
Burke's LG 15th edn (1937)
Burke's LG 17th edn (1952)
Burke's LG 18th edn vol i (1965)
Burke's LG 18th edn vol ii (1969)
Burke's LG 18th edn vol iii (1972)
Burke's LG 19th edn (2001-06 covering Scotland, Ridings of York, Wales)
Burke's LG Irish Family Records (1976 essentially LG for Ireland)
Burke's Extinct and Dormant Peerages (1883)
There are also quite a few works on orders of chivalry, American presidential families, the British royal family etc. There is also Burke's peerage books published on the eve of WWI and WWII.
S.S.