Historical clue formulations

• Sierra ___ — 2025-11-20
• Sierra ___ — 2025-03-12
• Sierra ___ — 2025-01-26
• Currency that replaced the British West African pound — 2024-03-02
• Sierra ___ (African country) — 2023-05-15
• Sierra ___ — 2023-03-12
• Sierra ___ — 2022-10-08
• Director Sergio — 2021-12-11
• Sierra ___ (African land) — 2021-03-22
• Sierra ___ — 2020-12-20
• Sierra ___ (African country) — 2020-08-17
• Sierra ___ — 2020-05-10
• Sierra ___ — 2020-03-01
• Sierra ___ — 2019-08-04
• Sierra ___ — 2019-02-13
• Film director Sergio — 2018-06-02
• Sierra ___ (African land) — 2017-11-06
• Sierra ___ (African land) — 2017-06-19
• Sierra ___ (African country) — 2016-10-31
• Currency in Freetown — 2016-08-20
• Sierra ___ — 2015-04-23
• Sierra ___ — 2014-02-18
• Sierra ___ — 2013-06-30
• Sierra ___ — 2013-04-02
• Sierra ___ — 2012-01-11
• Genre film director Sergio — 2011-10-22
• West African monetary unit — 2011-08-28
• West African currency — 2011-02-05
• Africa's Sierra ___ — 2010-12-20
• Sierra ___ — 2010-11-30
• Sierra ___ — 2010-09-29
• West African currency — 2009-09-18
• Director Sergio — 2009-07-12
• Sierra ___ — 2008-08-27
• Spaghetti western director Sergio — 2008-04-29
• Director Sergio — 2008-03-26
• Sierra ___, Africa — 2008-01-01
• Early collaborator with Eastwood — 2007-11-18
• West African currency — 2007-11-09
• Sierra ___ — 2007-09-11
• Sierra ___ — 2005-11-29
• Africa's Sierra ___ — 2005-02-14
• Sierra ___ — 2004-04-15
• Sierra ___ — 2004-02-17
• Spaghetti western director Sergio — 2003-12-24
• Sierra ___ — 2003-07-23
• Western director Sergio — 2003-06-08
• Western director Sergio — 2002-04-11
• Sierra ___ — 2002-02-28
• Sierra ___ — 2001-09-09