Yes, the concept of the Invisible Web is so 1999 and so not vernacular among the masses. But it still exists. What do you do when Google fails you? One option is to call (landline, cell, Skype), email, IM a librarian. Another path is to become aware of specialized resources and databases on the Web. Here is a collection of more than 100 resources that can help you find what you seek. It’s from the Online Education Database.