Social problems
History of Friedrich II of Prussia — Volume 20
History of Friedrich II of Prussia — Volume 14
History of Friedrich II of Prussia — Volume 10
History of Friedrich II of Prussia — Volume 16
History of Friedrich II of Prussia — Volume 19
History of Friedrich II of Prussia — Volume 11
History of Friedrich II of Prussia — Volume 02
History of Friedrich II of Prussia — Volume 05
History of Friedrich II of Prussia — Volume 04
History of Friedrich II of Prussia — Volume 01
