These files contains corrections for all errors in [BCN] known to us. Moreover, they provide some additional material and references. We thank all correspondents who pointed out errors to us. The files are in some obscure troff dialect, with most formatting removed. If you cannot read them, get the PostScript version (190kB).
There is a PostScript version that also has some more figures, tables, and references, and is more recent. No guarantee is given that both versions contain the same information, or are up-to-date.