Here is more of what Illinois says:
References for Principles and Practice of Engineering Examination:
Examinees may use any number of texts during the examination. No exchange of reference material
will be permitted during any examination session. Examinees may choose to change some of their
reference books between the morning and afternoon sessions.
All exams are open book. PE Civil must bring their own copies of the applicable design standards.
All reference books must be printed in the English language.
Books must be copyrighted and formally bound by the publisher.
The NCEES Transportation Design Standards and Structural Design Standards are referenced in
the Civil examination. Examination problems, which reference a standard of practice, are scored
based on these lists. To ensure that you have the most current copy available, you may obtain a copy
from the NCEES Web site at www.ncees.org.
The codes and standards used on the PE examinations are identified in the NCEES examination
specifications, such as the 2005 edition of the National Electrical Code (NEC) applies to any
code-related questions contained in the Electrical discipline examination.
Reference manuals published by Professional Publications, Inc., and Great Lakes Press, Inc., (which
includes reference manuals by Michael Lindeburg, Merle Potter and other authors) are permitted.
However, the accompanying solution manuals are not permitted.
Examples of books not approved include: Hicks Handbook, FAN Engineering, NCEES Study Guides,
solution manuals (which includes the solution manuals by Michael Lindeburg, Merle Potter, and other
authors published by Professional Publications, Inc., and Great Lakes Press, Inc.) and any other books
purported to be helpful in preparation for professional engineering examinations. The NCEES Fundamentals
of Engineering Reference Handbook will not be allowed in the examination.