The 1971 Supplement adds some 3,500 entries to the approximately 7,000 listed in the original volume and the 1965 Supplement. Like its predecessors this volume

The 1971 Supplement adds some 3,500 entries to the approximately 7,000 listed in the original volume and the 1965 Supplement. Like its predecessors this volume

The 1981 Supplement adds more than 3000 entries to the approximately 10,500 listed in the original volume and in the 1965 and 1971 Supplements. Like its predece