public boolean removeBook(String title)
	{
        boolean delete = false;
        if (aBookIndex.containsKey(title)) {
            Item tempBook = aBookIndex.remove(title);
            authorIndex.remove(((Book)tempBook).getAuthor());
            for (String s: tempBook.keywords) {
                keywordIndex.get(s).remove(tempBook);
            }
            delete = true;
        }
        return delete;

	}