Quickest way to find an item if you know the author and title
Use the Author or Title options only if you know the exact forms
Subject option
Yields only items catalogued under prescribed subject headings (ie Library of Congress headings see list of possible subject headings below). If you are not familiar with these, use:
Keyword Option(words from the title)
Usually yields more hits as it searches author, subject headings, titles and series
Union catalog of the holdings of thousands of libraries worldwide. Citations for books, journals, manuscripts, maps, music scores, sound recordings, films, computer files, newspapers, slides, videotapes, etc., in a variety of languages. WorldCat does not include individual articles, stories in journals, magazines, newspapers, or book chapters.