Why is the Library of Congress a useful site to search?

It is a subject directory site with links to various categories of information, from art to statistics.
The Library of Congress is a huge database with full text articles on many subjects.
It is a powerful search engine that allows the user to search "invisible" sites.
The Library of Congress is a site that uses nesting to allow for more precise searches.

Question

Why is the Library of Congress a useful site to search?

It is a subject directory site with links to various categories of information, from art to statistics.
The Library of Congress is a huge database with full text articles on many subjects.
It is a powerful search engine that allows the user to search "invisible" sites.
The Library of Congress is a site that uses nesting to allow for more precise searches.

goformit100 · Answer

It is a powerful search engine that allows the user to search "invisible" sites.

anonymous · Answer

@goformit100 Thanks