Social problems
History of Friedrich II of Prussia — Volume 17
History of Friedrich II of Prussia — Volume 18
History of Friedrich II of Prussia — Volume 19
History of Friedrich II of Prussia — Volume 20
History of Friedrich II of Prussia — Volume 21
History of Friedrich II of Prussia — Appendix
History of Friedrich II of Prussia — Volume 01
History of Friedrich II of Prussia — Volume 02
History of Friedrich II of Prussia — Volume 03
History of Friedrich II of Prussia — Volume 04
