At foot of title to vols 5-8: Second series. - At foot of title to vols 9-12: Third series. - Variant title to second and third series reads: Correspondence, despatches, and other papers, of Viscount Castlereagh, second Marquess of Londonderry. - Imprint for second series varies: London: William Shoberl, Publisher, 20, Great Marlborough Street. - Imprint for third series varies: London John Murray, Albemarle Street. - Volumes in the third series each have an additional titlepage. - With errata and addenda. - With 2 pages of press- notices for works published by Henry Colburn.