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The Politics Collection (comprised of the Political Science Database, Worldwide Political Science Abstracts, PAIS Index, and Policy File Index) forms part of the broader collection:
Library books are arranged by the Dewey Decimal classification scheme where each subject is represented by a number.
You will find books on the same subject will have the same number. The shelfmark is preceded by the letter D and will be followed by 3 letters, which are usually the first 3 letters of the author's name.
e.g. D 320.9411 MACG