He attended the Paris Peace Conference of 1919 and later worked on an official history of it, on a scheme devised by George Louis Beer and Lord Eustace Percy.
(ed. with G. P. Gooch and Harold Temperley) Die Britischen Amtlichen Dokumente über den Ursprung des Weltkrieges, 1898-1914, Berlin: Verlagsgesellschaft für Politik und Geschichte, 1926-1928.
Harold Pinter | Harold Wilson | Harold Macmillan | Harold Bloom | Harold Godwinson | Harold Lloyd | Harold Stassen | Harold Prince | J. Harold Ellens | Harold Holt | Sir Harold Hillier Gardens | Harold Washington | Harold Hitz Burton | Harold Alexander, 1st Earl Alexander of Tunis | Harold Peto | Harold & Kumar Go to White Castle | Harold Arlen | Harold | Harold Budd | Harold Eugene Edgerton | Harold Bauer | Harold von Schmidt | Harold Robbins | Harold Laski | Harold Gould | Harold Gillies | Harold Bradley | Harold Alexander | Harold Acton | Harold Scott MacDonald Coxeter |