Robert Southey. History of the Peninsular War. 3 vols. 1823-1828:

Vol.1 (1823):
https://archive.org/details/historypeninsul07soutgoog/page/n6
http://digital.onb.ac.at/OnbViewer/viewer.faces?doc=ABO_%2BZ177548306

Vol.2 (1827):
https://archive.org/details/bub_gb_JjoPAAAAYAAJ/page/n3

Vol.3 (1828/32?):
http://digital.onb.ac.at/OnbViewer/viewer.faces?doc=ABO_%2BZ177548409

New edition (1828): 6 vol. {in 8 parts????}:

Vol. 1{-1}:
https://archive.org/details/historyofpeninsu01sout/page/n10

Vol.1-2:
https://archive.org/details/historypeninsul09soutgoog/page/n7

Vol.2{-1}:
https://archive.org/details/historyofpeninsu02sout/page/n8

Vol.2-2:
https://archive.org/details/bub_gb_BZhjAAAAMAAJ/page/n6

Vol.3:
https://archive.org/details/historyofpeninsu03sout/page/n8

Vol.4:
https://archive.org/details/historyofpeninsu04sout/page/n8

Vol.5:
https://archive.org/details/historyofpeninsu05sout/page/n8

Vol.6:
https://archive.org/details/historyofpeninsu06sout/page/n6

Sorry: Much confusion - seems several printings of the 1st and 2nd editions were made.