Related Clues:

• See 66-Across
• Ant habitat
• Outpost
• Any of the original 13
• Former map inits.
• Erstwhile bloc letters
• Old union mem.
• Estonia, once: Abbr.
• Lithuania, once: Abbr
• Old map letters
• Letters after "Latvian," once
• Part of an empire up to 1991: Abbr.
• Abbreviation on old maps
• Former empire abbr.
• Mem. of an old union