The Web page that provides some examples and guides to resources for Virtual Tours, Field Trips, and other Web resources for teaching.
Links to reference material:
ED 558: Special Methods Social Studies
Your answer:
Internet Searching Tools - http://www.sou.edu/library/searchtools
Google - http://www.google.com
Yahoo - http://www.yahoo.com
All of the above, but a list of search tools is available from the Internet Search Tools page