The University has 114 libraries. The main one is called "Cambridge University Library". It is a legal deposit, which means every book that is printed in the United Kingdom goes in this library. Many departments have their own library as well. They usually have special books for their subjects only. All colleges have a library. This is mainly for the undergraduates, so that they can read basic books about their subjects. Some colleges also have very precious books and manuscripts. For example, the Parker Library (Corpus Christi College) has special books from Medieval times.