This is a collection of documents on English history. Editorial comment is directed towards making sources intelligible rather than drawing conclusions from them. Full account has been taken of modern textual criticism. A general introduction to each volume portrays the character of the period under review and critical bibliographies have been added to assist further investigation. Documents collected include treaties, personal letters, statutes, military dispatches, diaries, declarations, newspaper articles, government and cabinet proceedings, orders, acts, sermons, pamphlets, agricultural instructions, charters, grants, guild regulations and voting records. Volumes include genealogical tables, lists of officials, chronologies, diagrams, graphs and maps.

In "William the Conqueror", Professor Douglas analyzes the causes and the true character of the Norman impact upon England in the eleventh century. The work is both a study of Anglo-Norman history and a biography of a man whose personal career was spectacular, and as reviewers have remarked, it is distinguished by a wealth of scholarship linked to a lucid and agreeable style.