Several years later . . .

The book to which you linked has moved. It is now available here.

I post this in case others who come later might be searching for similar information and disappointed at the broken link. Also, in case the location should change again, the title of the book is PostgreSQL: Introduction and Concepts, and its author's name is Bruce Momjian. It dates back to 2000, though. There are newer books available, if you're willing to shell out the cash.