Historical clue formulations

• Treeless tracts — 2026-08-09
• Siberian stretches — 2020-02-29
• Central Asian plains — 2018-04-18
• Open terrain — 2011-03-13
• Part of Russia, with "the" — 2006-09-28
• Prairielands abroad — 2002-06-16
• Cossack's turf — 2001-12-19
• Where the Golden Horde lived — 2001-09-20
• Asian plains — 2000-10-31
• Russian 15-Across, with "The" — 1999-06-25
• Russian plain, with "the" — 1998-09-14
• "Doctor Zhivago" locale — 1995-06-10