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Richard, I want to purchase the Aerodynamics Prep Exam. I have already purchased the Performance prep exam and as such have an account/log-on. When...

Richard, I have posted this in other areas and then found this spot. Apologies if it becomes annoying. I am interested in the E Books but was wonde...

Bob, I am interested in the E Books but was wondering if they are down-loadeable or if you have to be on-line to access them. I spend an inordinate...