There is an index back to 1851 in paper. The WWW offers us an opportunity to find information and data from all over the world. Since anyone can write a web page excellent resources exist along side the most dubious on the web. Below is a checklist of what you should look for on a web page before using it as a resource. Descriptions or annotations in these search engine catalogs are generated by the software.
Directories contain sites that have been selected and reviewed by people.
A number of these directories provide their own annotations to sites, enhancing the information you will find about a site. Looksmart is a good example of a directory. All information, whether in print or in html, needs to be evaluated by readers. Never use information that you cannot verify. Question, question, question before you use the page.