gochemistry,
I used Crane #410 for hydraulics, Smith/Van Ness for Thermodynamics, McCabe/Smith for Unit Ops and Lindeburg ChemE Reference manual for everything else. I also brought a spiral binder with the problems that I studied, but I don't remember using it.
Remember, in each 4 hour session you will see 40 problems - 10 an hour or 6 minutes each. While you study you should time yourself to make sure that you are not exceeding this time limit. Make sure you study 2-3 hours per day, 3-4 days a week for at least 10 weeks before the exam. The sample problems on the NCEES website are pretty close to what you see in the test. Put tags on the edge of each page that has information you think you will need in the test so that you can find it quickly.
I had prepared well enough that I averaged 3 minutes a problem. I was able to take a 15 minute break for breakfast in the middle of the first session and still finish early. One of my buddies took 2 weeks off of work to study, brought a bunch of reference books and still did not pass.
A little preparation is all it takes.
I wish you well on the exam...