Be sure to get a first or second edition (I personally prefer the tre classy red+white first edition), with the original art (I think Ullman did it himself, as the same style is used on the cover of his "Introduction to Automata Theory, Languages and Computation", but neither book provides cover art credits --- argh!). That's the best part of this book, which is pretty well wafflestomped by Muchnick's "Advanced Compiler Design and Implementation".
Nowadays, the chances of applying of that is flat zero unless you are working on something with no to low impact. At the same time, it has a fundamental overview of many of parsing-routine options available today.
Awesome! Take me some taking to finish off the reading ...but certainly not finished...it is a kinda book ,people like me, time to time flock into it, just to brush up thing. Highly recommended someone in the field of CS.