Historical clue formulations

• German "or" — 2023-09-17
• German/Polish border river — 2021-06-22
• Poland/Germany border river — 2018-04-17
• Baltic Sea feeder — 2017-03-12
• It forms part of the Polish/German border — 2016-01-08
• River through Silesia — 2014-02-08
• Frankfurt's river — 2013-06-09
• River to the Baltic — 2013-05-01
• Baltic Sea feeder — 2012-09-25
• River through Wroclaw — 2012-07-15
• River separating Germany and Poland — 2012-04-17
• Baltic Sea feeder — 2011-12-26
• Baltic feeder — 2011-04-01
• Polish/German border river — 2011-02-21
• The Warta's outlet — 2010-09-11
• River to the Baltic — 2010-08-01
• Wroclaw's river — 2010-06-01
• German/Polish border river — 2010-03-22
• German border river — 2010-02-17
• Baltic Sea feeder — 2009-07-06
• ___-Neisse Line — 2009-04-10
• European boundary river — 2009-02-15
• Baltic feeder — 2008-09-16
• Wroclaw's river — 2008-09-13
• The Szczecin Lagoon is an extension of its mouth — 2008-08-08
• ___-Neisse Line — 2007-10-26
• Baltic feeder — 2007-01-17
• ___-Neisse Line (border in Europe) — 2006-09-15
• Polish border river — 2005-08-30
• German/Polish border river — 2005-02-13
• Szczecin's river — 2004-05-30
• European border river — 2004-03-20
• River of Brandenburg — 2003-03-06
• German border river — 2002-12-31
• Germany's ___-Spree Canal — 2002-02-17
• German border river — 2002-01-24
• River to the Baltic — 2001-12-06
• River to the Baltic — 2001-06-27
• Frankfurt an der ___ — 2001-06-08
• Baltic Sea feeder — 2001-05-08
• River of Brandenburg — 2001-03-04
• River of Frankfurt — 2000-11-19
• Frankfurt's river — 2000-02-22
• Part of the German/Polish border — 1999-11-30
• Frankfurt's river — 1999-11-29
• River to the Baltic — 1999-03-16
• River to the Baltic — 1999-02-08
• Baltic Sea tributary — 1999-01-08
• Frankfurt's river — 1998-12-21
• Frankfurt's river — 1998-10-12