Historical clue formulations

• Plains tribe members — 2021-04-21
• Plains people — 2020-02-08
• Some Siouans — 2019-03-12
• Plains tribe members — 2017-05-09
• Plains tribe — 2016-12-10
• Some Siouans — 2016-10-07
• Midwest tribe — 2015-09-08
• Relatives of Winnebagos — 2015-08-15
• Plains Indians — 2013-11-27
• Oklahoma tribesmen — 2013-05-29
• Little Thief's people — 2012-09-08
• Buffalo-hunting Indians — 2011-06-02
• Chief Whitehorse and tribesmen — 2011-05-24
• Siouan people — 2011-01-10
• Western tribe — 2010-09-28
• Plains tribe — 2010-08-30
• Platte River people — 2010-01-27
• Plains Indians — 2010-01-13
• People of the Platte, once — 2009-07-17
• Siouan speakers — 2009-05-13
• Platte River tribe — 2009-04-10
• Dwellers along the Platte, once — 2009-02-15
• Siouan people — 2008-10-19
• Western tribe — 2008-03-23
• Natives of Noble County, Okla. — 2008-02-08
• Former Platte River dwellers — 2005-09-17
• Early Nebraskans — 2004-12-12
• People of the Platte — 2004-10-15
• Platte River people — 2004-04-23
• Part of the Winnebago nation — 2002-10-31
• Siouan people — 2002-10-16
• People on the Platte — 2002-10-13
• Platte River tribe — 2002-08-25
• Platte River people — 2002-02-19
• Oklahoma tribe — 2001-11-11
• Nebraska natives — 2001-09-05
• Former Platte River inhabitants — 2000-12-22
• Native Oklahomans — 1998-08-14
• Western Indians — 1998-03-03
• Western Indians — 1997-12-30
• Siouan Indians — 1994-01-02