PE Breadth Study Topics correspond to sections in the Exam Specifications found on the NCEES website.
Links to specification PDFs from the NCEES website:
Civil: Construction (design standards updated January 2012)
Civil: Structural (design standards updated January 2012)
Civil: Water Resources and Environmental
These specifications are the best indicator of the subject matter that will be on the test, follow the topics listed here closer than anything any book tells you.