This book is an incredible achievement. There is a new edition although, in the wake of the almighty downfall of the humanities, I shied away from it and picked this 1993 edition up instead; saving myself some money to spend on other books in the process.
This was not the only reason however: This informative review- http://www.amazon.com/review/R3323XRVPMBKCZ/ref=cm_cr_dp_title?ie=UTF8&ASIN=0691154910&nodeID=283155&store=books -further raised my suspicions.
Overall it is great to have this on the shelf to refer to when I'm studying and something is slipping my mind. It is also interesting to flick through during any downtime I find during the day.