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http://www.urz.uni-heidelberg.de/subject/hd/fak7/hist/o2/9/0/1/ (Einblicke ins Internet, 10/1995)

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• 901 without subdivision
• 901.00285 Data processing
• 901.016 Bibliography
• 901.3 Social sciences
• 901.32 Political Science
• 901.37 Education
• 901.4 Language