• Russia (1923- U.S.S.R.) (AACR1 heading)
• Russia (Card Catalog Subject)
• Soviet Union (Former AACR2 heading)

Russia (Federation) (e-ru---) (ru)

• Russia (1917- R.S.F.S.R.) (AACR1 heading)
• Russia or Russian Republic (Card Catalog Subject)
• Russian S.F.S.R. (Former AACR2 heading)

Armenia (Republic) (e-ai---) (ai)(heading also valid 1918-1920)

• Armenian S.S.R. (AACR1 heading)
• Armenia (Card Catalog Subject)
• Armenian S.S.R. (Former AACR2 heading)

Azerbaijan (e-aj---) (aj)

• Azerbaijan (AACR 1 heading)
• Azerbaijan (Card Catalog Subject)
• Azerbaijan S.S.R. (Former AACR2 heading)

Belarus (e-bw---) (bw)

• Byelorussian S.S.R. (AACR1 heading)
• White Russia (Card Catalog Subject)
• Byelorussian S.S.R. (Former AACR2 Heading)

Estonia (e-er---) (er)

• Estonian S.S.R. (AACR1 heading)
• Estonia (Card Catalog Subject)
• Estonia (Former AACR2 heading)

Georgia (Republic) (e-gs---) (gs) (heading also valid 1917-1921)

• Georgia (Transcaucasia) (AACR1 heading)
• Georgia (Transcausia) (Card Catalog Subject)
• Georgian S.S.R. (Former AACR2 heading)

Kazakhstan (e-kz---) (kz)

• Kazakh S.S.R. (AACR1 heading)
• Kazakhstan (Card Catalog Subject)
• Kazakh S.S.R. (Former AACR2 heading)
• Kazakstan (Another former AACR2 heading)
  Note: Be aware that the AACR2 heading has jumped back and forth in the use of h in Kazakhstan.

Kyrgyszstan (e-kg---) (kg)

• Kirghiz S.S.R. (AACR1 heading)
• Kirghizistan (Card Catalog subject)
• Kirghiz S.S.R.

Latvia (e-lv---) (lv)

• Latvian S.S.R. (AACR1 heading)
• Latvia (Card Catalog subject)
• Latvia (Former AACR2 heading)

Lithuania (e-li---) (li)

• Lithuanian S.S.R. (AACR1 heading)
• Lithuania (Card Catalog subject)
• Lithuania (Former AACR2 heading)

Moldova (e-mv---) (mv)

• Moldavian S.S.R. (AACR1 heading)
• Moldavia (Card Catalog subject)
• Moldavian S.S.R. (Former AACR2 heading)

• Tajik S.S.R. (AACR1 heading)
• Tajikistan (Card Catalog subject)
• Tajik S.S.R (Former AACR2 heading)

Turkmenistan (e-tk---) (tk)

• Turkmen S.S.R. (AACR1 heading)
• Turkmenistan (Card Catalog subject)
• Turkmen S.S.R. (Former AACR2 heading)

Ukraine (e-un---) (un)

• Ukraine (AACR1 heading)
• Ukraine (Card Catalog subject)
• Ukraine (Former AACR2 heading)

Uzbekistan (e-ur-uz) (uz)

• Uzbek S.S.R. (AACR1 heading)
• Uzbekistan (Card Catalog subject)
• Uzbek S.S.R. (Former AACR2 heading)