10 Search Engines to Explore the Deep End of the Invisible Web
he Invisible Web refers to the part of the WWW that’s not indexed by the search engines. Most of us think that that search powerhouses like Google and Bing are like the Great Oracle…they see everything. Unfortunately, they can’t because they aren’t divine at all; they are just web spiders who index pages by following one hyperlink after the other. But there are some places where a spider cannot enter. Take library databases which need a password for access. Or even pages that belong to private networks of organizations. Dynamically generated web pages in response to a query are often left un-indexed by search engine spiders.The Educator's Reference Desk: Resource Guides
The Educator's Reference Desk builds on over a quarter century of experience providing high-quality resources and services to the education community. From the Information Institute of Syracuse, the people who created AskERIC, the Gateway to Educational Materials, and the Virtual Reference Desk, the Educator's Reference Desk brings you the resources you have come to depend on. 2,000+ lesson plans, 3,000+ links to online education information, and 200+ question archive responses.
governmental (US) databases such as Ask Eric, which provide access to over 3000 educational resources (organized by category)