Breadth

PE Breadth Study Topics correspond to sections in the Exam Specifications found on the NCEES website.

Construction

Geotechnical

Structural

Transportation

Water Resources and Environmental

Links to specification PDFs from the NCEES website:

Civil: Construction (design standards updated January 2012)
Civil: Geotechnical 
Civil: Structural (design standards updated January 2012)
Civil: Transportation
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.