There were five printings of this book. The 2nd printing claims it's the 3rd, the 3rd claims it's the 4th, but the 1st, 4th and 5th have it right. You can tell by the copyright dates which one you truly have – 1991 == 1st, 1992 == 2nd, 1995 == 3rd, 1999 == 4th, post 1999(?) == 5th.
While all are supposedly the same book, the errata for the 3rd printing is extensive, while the others are not. Apparently the whole book was re-typeset and a lot of issues crept in. The 3rd printing is the first one with the new cover.