R. G. Collingwood is an important 20th-century historian, archaeologist and philosopher whose works are the subject of continued interest, analysis and study. There is an unquestionable need to support this research activity with the provision of a reference guide which is fully up-to-date, informed and authoritative. The Companion therefore lists all primary and secondary material relevant to the study of Collingwood in all his fields of expertise - historical theory, philosophy and archaeology. It also provides a guide to archive material relevant to his life, together with sources and locations. The resulting volume is an essential companion to the understanding of the life and thought of R. G. Collingwood. The authors have succeeded admirably in their aim [of aiding researchers in Collingwood studies], but they have achieved much more. Each of the contributors, James Connelly, Peter Johnson and Stephen Leach are passionate about the work Collingwood produced ... The volume therefore exudes an excitement that one does not expect to find in such research companions ... The listing of over 1,000 letters, with indications, of varying lengths, of their contents and importance, is not only a labour of love, but also a resource that will lead scholars to an Aladdin's cave of treasures.