The Dictionary of Deities and Demons in the Bible can be found on Google Books. It's a really shoddy scan, and as always, there are pages missing. But as it consists of encyclopedic entries, it's a minor bother. The articles have been written by top scholars, and while some of them do get a bit over-excited at times, it's still full of fascinating tid-bits.
Anyway, if you're curious about what I'm writing my thesis on, look up "Sea".