Gundark
Explorer
Moreover, if you'd rather have the book than look it up in a disjointed fashion online, Paizo has a very aggressive pricing structure for the electronic versions of main game books. They offer multiple ways for the consumer to get the non-core material referenced in the adventures, something I appreciate.
Marketing aside, free or paid aside, the more content you put out for your game the more it becomes saturated with content. I think nobody is arguing that Paizo has done a poor job of selling their product to their fanbase. Clearly they are doing a very good job. The idea is that at some point this becomes a bloated mess, it happened with WotC, and the process is happening with Paizo