I've purchased EVERY book I can find on the topic of Pacific Northwest Coast Native Indian artwork (currently I have over 160), and this is one of the best if you want to try your hand at this type of artwork.
This book contains tons of examples, explanations, and a nice amount of info about the tribes and styles. This is the only book I've found with a section that actually takes you step-by-step through the process of creating some Northwest Coast art! (Note that the recently-published volume 2 also does.)
The only downside I can see is that the artwork is relatively "modern" and representational, and does not cover some of the older or more abstract styles. On the other hand, it does not seem to be intended to be complete. The goal of the book is to help someone delve into this sort of artwork, and it does that very well. I've taken in-person classes from several people who are acknowledged experts in the field and/or natives (including a Haida Master Carver), and they teach the same sorts of basics this book does.
If you want to try your hand at drawing this kind of art, I recommend that you buy "Looking at Indian Art of the Northwest Coast" by Hilary Stewart as an excellent book for giving you an overview and feel for the art form, buy this book and volume 2 by the same authors for the extensive examples and how-to information, and I also recommend "An Analysis of Form" by Bill Holm, which is the single most in-depth study of the elements that are used in PNWC artwork.