Complete Peerage
Complete Peerage by G.E. Cokayne is a comprehensive and authoritative source for the peerage of England. Originally published in 8 volumes between 1887 and 1898, the high level of scholarship generally holds up well until today. Though, like all works of its kind, improvements and corrections to CP are constantly being made.
From 1910 to 1959, 'revised and expanded' versions were published. This stretched the original 8 volumes to 13. Finally, in 1998 a 14th volume of 'Additions and Corrections' was published. Many additional corrections, most of which were first noted on the SGM newsgroup, have been collected by Chris Phillips on his Medieval Genealogy site.
Revised and Expanded Second Editions
Cokayne, George Edward ed. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. I: Ab Adam - Basing, 2nd edition. (London,1910).
Archive.org 1910 ed. FamilySearch.org LINK
Cokayne, George Edward and Vicary Gibbs ed. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom,Vol. II: Bass - Canning, 2nd edition (London, 1912).
Archive.org 1912 ed. FamilySearch.org LINK
Cokayne, George Edward and Vicary Gibbs ed. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. III: Canonteign - Cutts, 2nd edition. (London, 1913).
Archive.org 1913 ed. FamilySearch.org LINK
Cokayne, George Edward and Vicary Gibbs ed. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. IV: Dacre - Dysart, 2nd edition. (London, 1916).
Archive.org 1916 ed. FamilySearch.org LINK
Cokayne, George Edward and Vicary Gibbs ed. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. V: Eardley of Spalding to Goojerat, 2nd edition. (London, 1926).
Archive.org 1926 edition FamilySearch.org LINK
Cokayne, George Edward and H.A. Doubleday et. al eds. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. VI: Gordon to Hurstpierpoint, 2nd edition. (London, 1926).
Archive.org not yet available FamilySearch.org LINK
Cokayne, George Edward and H.A. Doubleday et. al eds. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. VII: Husee to Lincolnshire, 2nd edition. (London, 1929).
Archive.org 1929 edition FamilySearch.org LINK
Cokayne, George Edward and H.A. Doubleday et. al eds. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. VIII: Lindley to Moate, 2nd edition. (London, 1932).
Archive.org not yet available FamilySearch.org LINK
Cokayne, George Edward and H.A. Doubleday et. al eds. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. IX: Moels to Nuneham, 2nd edition. (London, 1936).
Archive.org not yet available FamilySearch.org LINK
Cokayne, George Edward and H.A. Doubleday et. al eds. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. X: Oakham to Richmond, 2nd edition. (London, 1945).
Archive.org not yet available FamilySearch.org LINK
Cokayne, George Edward and Geoffrey White ed. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. XI: Rickerton to Sisonby, 2nd edition. (London, 1949).
Archive.org not yet available FamilySearch.org LINK
Cokayne, George Edward and Geoffrey White ed. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. XII part 1: Skelmersdale to Towton, 2nd edition. (London, 1953).
Archive.org not yet available FamilySearch.org LINK
Cokayne, George Edward and Geoffrey White ed. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. XII part 2: Tracton to Zouche, 2nd edition. (London, 1959).
Archive.org not yet available FamilySearch.org LINK
Cokayne, George Edward and H.A. Doubleday et. al eds. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. XIII: Peers Created 1901 to 1938. (London, 1940).
Archive.org not yet available FamilySearch.org LINK
Cokayne, George Edward and Peter Hammond ed. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. XIV: Addenda and Corrigenda, (1998).
Archive.org not yet available FamilySearch.org LINK
Older, First Edition Printings
Cokayne, George Edward. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. 1: A - Bo. (1887).
Google Books 1887 ed. Family Search 1887 ed.
Cokayne, George Edward. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. 2: Bra. - C. (1889).
Cokayne, George Edward. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. 3: D - F. (1890).
Cokayne, George Edward. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. 4: G - K. (1892).
Cokayne, George Edward. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. 5: L - M. (1893).
Archive.org 1893 ed. Family Search 1893 ed.
Cokayne, George Edward. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. 6: N - R. (1895).
Cokayne, George Edward. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. 7: S - T. (1896).
Google Books 1896 ed. Family Search1896 ed.
Cokayne, George Edward. Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Vol. 8: U - Z. (1898).
Archive.org 1898 ed. Family Search1898 ed.
Complete Baronetage
Cokayne, George Edward. Complete Baronetage vol. 1 (1611-1625), (1900).
Cokayne, George Edward. Complete Baronetage vol. 2 (1625-1649), (1902).
Cokayne, George Edward. Complete Baronetage vol. 3 (1649-1664), (1903).
Cokayne, George Edward. Complete Baronetage vol. 4 (1665-1707), (1904).
Cokayne, George Edward. Complete Baronetage vol. 5 (1707-1800), (1906).