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  1. 1
    by Kelsen, Hans, 1881-1973
    Published 1952
    Book
  2. 2
    by Engel, Salo, 1908-
    Published 1964
    Book
  3. 3
    Government Document Book
  4. 4
    by Kelsen, Hans, 1881-1973
    Published 1999
    Book