I have no doubt that you can learn about REST web services from this book.
However usually when people talk about "Web Services" in general they are talking about SOAP Web Services and possibly how there are applied in a "Services Oriented Architecture". Most of the tools available today generate SOAP Web Services. The design principles of REST are aimed at a "Resource Oriented Architecture" (see the sample chapterThe Resource Oriented Architecture). Currently mainstream tools do not support RESTful web services all that well because there are very few "toolable standards" (e.g. WADL (Web Application Description Language)). However the book does look at Ruby on Rails, Restlet (Java), and Django (Python) as tools for building RESTful web services.
Every snowflake is perfect and unique. And every snowflake contains a very tiny ad.