The second edition updates the first and adds significant new entries either previously missed or having achieved importance since. It contains approximately 2,500 subject and biographical entries, and some 20,000 references. Biographies are now in the fourth volume as a unit rather than mixed with subject entries. The second edition updates the first and adds significant new entries either previously missed or having achieved importance since. It contains approximately 2,500 subject and biographical entries, and some 20,000 references.
Biographies are now in the fourth volume as a unit rather than mixed with subject entries.