Alan Pearce is making his book, Deep Web for Journalists, available free online. He says:
Inside you will learn how to avoid the attention of even the most sophisticated snoopers, how to transfer and store information securely, and how to avoid the many traps that lie in wait for today’s journalists and researchers.
The second half of the book is devoted to fine-tuning our search skills. Understanding how to interrogate any search engine is essential but knowing where to look is often more important.