Columbia subject headings:
Castrén, Erik J. S. (Erik Johannes Sakari), 1904-1984.
International law.
Harvard subject headings:
Castrén, Erik J. S. (Erik Johannes Sakari), 1904-1984
International law.
Princeton subject headings:
Castrén, Erik J. S. (Erik Johannes Sakari), 1904-1984.
International law.