Historical clue formulations

• Onetime union member: Abbr. — 2025-05-03
• Latvia, e.g., once: Abbr. — 2025-03-16
• Armenia, e.g., until 1991: Abbr. — 2025-01-29
• Old atlas inits. — 2025-01-25
• Latvia or Estonia, pre-1991: Abbr. — 2024-12-23
• One of 15 boycotting the 1984 Summer Olympics: Abbr. — 2024-12-01
• Georgia, for most of the 20th century, in brief — 2023-05-03
• 20th-century map inits. — 2022-07-23
• Azerbaijan or Lithuania, once: Abbr. — 2022-06-22
• Kazakhstan, e.g., formerly: Abbr. — 2022-05-05
• Old atlas inits. — 2022-03-08
• Ukr. or Lith., formerly — 2021-08-15
• Tajikistan, e.g., once: Abbr. — 2021-07-11
• Map abbr. until 1991 — 2021-02-23
• Union member of the 20th century, for short — 2021-01-31
• Kirghizia or Byelorussia: Abbr. — 2021-01-10
• Ukr., e.g., once — 2020-06-28
• Lith., e.g., once — 2020-01-15
• Georgia, once: Abbr. — 2019-12-29
• Map abbr. before 1991 — 2019-12-11
• Abbr. in an old atlas — 2019-09-27
• Georgia, once: Abbr. — 2019-04-25
• Byelorussia, e.g.: Abbr. — 2019-04-15
• Georgia, once: Abbr. — 2019-01-20
• Abbr. on old Eurasian maps — 2018-06-08
• Cold War-era inits. — 2018-06-03
• Ukr., e.g., once — 2018-04-02
• Any of the Baltic states, once: Abbr. — 2018-03-11
• Old union member: Abbr. — 2017-11-11
• 70-Across, e.g., formerly: Abbr. — 2017-05-02
• Ukr., e.g., once — 2017-03-07
• Old map abbr. — 2017-02-11
• Cold War land: Abbr. — 2016-10-09
• Kazakhstan, once: Abbr. — 2016-09-21
• Lat. or Lith., once — 2016-07-24
• Old atlas inits. — 2016-05-27
• Old atlas inits. — 2016-02-02
• Old geographical inits. — 2016-01-08
• Any of the Baltic states, once: Abbr. — 2015-11-17
• Cold War-era territory: Abbr. — 2015-10-04
• Georgia, once: Abbr. — 2015-05-17
• One of a geog. 15, once — 2015-04-08
• Estonia, once: Abbr. — 2015-04-06
• State of old, briefly — 2015-02-28
• One of 15 until 1991: Abbr. — 2015-02-08
• 37-Across was the smallest one: Abbr. — 2014-09-25
• Letters in old atlases — 2014-07-19
• Moldavia, e.g.: Abbr. — 2014-03-25
• Old atlas initials — 2014-02-16
• Old map abbr. — 2013-12-28