c.1 The origins of empire /ed. by Nicholas Canny ; ass. ed. by Alaine Low,.- c.2 The eighteenth century /ed. by P.J. Marshall.- c.3 The nineteenth century /ed. by Andrew Porter ; ass. ed. by Alaine Low.- c.4 The twentieth century /ed. by Judith M. Brown and Wm. Roger Louis.- c.5 Historiography / ed. by Robin W. Winks ; associate ed. by Alaine Low.