Expert C Programming, Deep C Secrets , by Van Der Linden, published by Prentice Hall. Pthreads Programming , by Nichols, Buttlar, and Farrell, published by O'Reilly and Associates. It is amazing to me that the thread paradigm hasn't become more popular. This is a great threads reference book. Other Visual Explanations , by Tufte, published by Graphics Press.
Tufte tackles the difficult task of visualizing data in a manner that is meaningful and clear.
As a technical expert, you will eventually be called upon to present to members of senior and executive management. You must be capable of preparing a clear and crisp presentation. Tufte will show you how.