Historical clue formulations

• South American grassland — 2024-02-04
• Patagonian prairie — 2023-06-29
• Grassy plain in South America — 2022-11-21
• Grassy plain — 2022-05-18
• Cattle-grazing tract — 2022-03-19
• Grassy South American plain — 2021-08-31
• Grassy plain of the Southwest — 2020-12-10
• South American plain — 2020-05-13
• Ranchero's plain — 2020-01-08
• Grassy plain — 2019-11-19
• Treeless plain — 2018-04-22
• South American prairie — 2017-03-26
• Vast prairie — 2015-02-13
• Grassy expanse in the Southwest — 2013-03-04
• Grassy plain — 2012-06-10
• Grassy plain of the Southwest — 2011-08-08
• Gaucho's plain — 2010-12-21
• Southwest plain — 2010-12-09
• Grassy plain — 2009-01-14
• Grassy plain of South America — 2006-08-07
• Treeless plain — 2006-07-20
• Caballero's locale — 2005-12-02
• Plain of the Southwest — 2005-02-18
• The plain in Spain — 2004-01-07
• Gaucho's turf — 2003-08-31
• Grassy plain — 2002-02-04
• Treeless tract — 1998-03-15
• Grassy plain — 1998-02-11
• Cattle-grazing area — 1996-04-28
• Texas plain — 1995-01-15
• Grassy plain — 1994-09-12
• Southwest plain — 1994-03-02