Searching in the Library Catalog
you could enter any topic as a Subject search in the Library Catalog.
However, the Subject search uses special terms to organize
books by subject. These are called Library
of Congress Subject Headings (LCSH for short). If you enter
your keywords as a Subject search, you may not get much back. For
If you entered
a Subject Heading search for: acquired immune
would get no books!
But if you searched
using the LCSH term, AIDS (Disease)
you'd see the library has 50+ books.