Webmasters will like this. 350 pages.
Drupal 6 Search Engine Optimization : Rank High in Search Engines with Professional SEO Tips, Modules, and Best Practices for Drupal Web Sites, Ben Finklea, Packt, 2009
If you want your website to rank highly at Google, this is the book to read. 250 pages.
Internet Marketing from the Real Experts – 3 Minute Lessons on Affiliate Marketing, Email Marketing, Search Engine Optimization Social Media and Much More, 2010
Search engine optimization all-in-one for dummies / by Bruce Clay, Wiley, 2009
750 pages: the largest dummies book ever! You will find much of this book basic if you are already the webmaster for a site. However, keep reading past the basics; you have much to learn from this book.