Via LLRX – Deep Web Research 2012: Marcus P. Zillman’s extensive research over the years into the “invisible” or “deep” web indicates that it covers somewhere in the vicinity of 1 trillion plus pages of information located throughout the Internet in various files and formats that current search engines either cannot locate, or have difficulty accessing. The current search engines find hundreds of billions of pages at the time of this publication. His guide provides extensive and targeted resources to facilitate both a better understanding of the history of deep web research as well to effectively and productively search for and locate these often undiscovered but critical documents.