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