This is the first volume of what promises to be a classical and authoritative account of the occupation of the Ruhr. The author, a trained historian, has been working for years on the collection and ordering of the necessary materials. Supported by the city governments of the Ruhr district, he has been able to consult all the governmental records as well as the archives of many of the leading industrial concerns which played a part in the crisis. In addition he has made use of all the available book, pamphlet and press material, not only of Germany but of other countries. The work is not intended as propaganda, and is well-documented and dispassionate. It easily supersedes all other accounts of the Ruhr invasion as seen from the German side.