Subject searches are tricky.
They use a controlled vocabulary that may make it difficult for you to find exactly what you are looking for. If you don't find your topic in the subject search, you can either try to think of some synonyms to search under, or you can try a keyword search. Keyword searching is very flexible. All of these are important and will save you time looking in the wrong place or looking in the right place for a book which is checked out or lost. We use the Library of Congress Classification System to organize the books in the library.