 The 1926 "Encyclopædia Britannica", in addition to its article on the river Ruhr, has a further article on "RUHR, the name given to a district of Westphalia, Germany".Thus the name "Ruhr" was given to the region (as a short form of "Ruhr District" or "Ruhr Valley") only a few years before the publication of this edition of the "Encyclopædia Britannica".Even after World War II, the term "Ruhr" may not have been in general use for the region