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Letters on pre-1991 maps
Answer for the clue "Letters on pre-1991 maps ", 3 letters:
ssr
Alternative clues for the word ssr
Word definitions for ssr in dictionaries
Douglas Harper's Etymology Dictionary
Word definitions in Douglas Harper's Etymology Dictionary
1926, from Russian, initialism (acronym) for Sovetskaya Sotsialisticheskaya Respublika "Soviet Socialist Republic."