At the risk of seeming egocentric, I am going to put myself up as a reference on a wide number of topics, mainly because I probably have a book on the topic in my library: Naval aviation, WWII, electronics, communications, physics, languages, Rome & China, aeronautical engineering, navigation, celestial mechanics (that's orbits etc). If anyone wants details, just give me your scenario, and I will try to find something specific for you
I can also help beginners through the navigation of publishing on createspace.
(Moose note - If other members have useful skills they'd like to highlight you can create your own page like this, for the minute put it under general resources. When I get hold of Daniel, we'll create a category for them)