Additional Resources for page 391

Web site: Library of Congress 

Web site: USA.gov 

Web site: NASA.gov

Web site: CIA.gov 

Web site: The World Factbook, CIA

Web site: Internet Public Library 

Web site: EBSCO

Web site: ProQuest

Web site: OverDrive

Web site: Amazon

Web site: Barnes & Noble 

Web page: Definition of: surface Web, PC Magazine 

Web page: Definition of: deep Web, PC Magazine

Web page: White Paper: The Deep Web: Surfacing Hidden Value, Journal of Electronic Publishing, U of Michigan

Web site: The Official CAPTCHA Site

Web site: The Web Robots Pages

Web page: How Internet Search Engines Work, HowStuffWorks

Web page: Search Engine Indexing and Robots.txt Files, HowTo.gov