Editors. "Treaty of Dusseldorf". The Literary Encyclopedia. First published 01 February 2011; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15919, accessed 21 April 2015.]
The Dukes of Brandenburg and Neuburg sign the Treaty of Dusseldorf for mutual defence against the destructive forces of the Thirty Years War.
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