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Resources share the relationship sub focus to 20th century
- Aircraft accidents -- England -- History -- 20th century
- Racism -- Oklahoma -- Tulsa -- History -- 20th century
- Jewish girls -- Poland -- 20th century -- Fiction
- Literature and society + History -- 20th century
- North Dakota -- Civilization -- 20th century
- Alabama -- History -- 20th century -- Fiction
- Victims of state-sponsored terrorism -- Chile -- 20th century -- Fiction
- Cambridgeshire (England) -- History -- 20th century
- Monarchy -- Great Britain -- History -- 20th century
- Espionage + History -- 20th century
- Counterrevolutionaries -- Cuba -- History -- 20th century
- Chicago (Ill.) -- History -- 20th century
- Popular culture + History -- 20th century
- Harlem (New York, N.Y.) -- Intellectual life -- 20th century
- Seismology -- Alaska -- Prince William Sound Region -- History -- 20th century
- Art treasures in war -- Italy -- History -- 20th century -- Fiction
- Republican Party (U.S. : 1854- ) -- History -- 20th century
- Droughts -- Great Plains -- History -- 20th century -- Fiction
- United States, Air Force -- History -- 20th century
- Birmingham (Ala.) -- Race relations -- History -- 20th century
- Influenza + History -- 20th century -- Comic books, strips, etc
- Bucharest (Romania) -- History -- 20th century -- Fiction
- United States, National Aeronautics and Space Administration -- History -- 20th century
- Jews -- Denmark -- History -- 20th century
- Government, Resistance to -- Europe -- History -- 20th century
- Children + Social conditions -- 20th century
- Songs -- 20th century -- Analysis, appreciation
- College students + Political activity -- Germany -- Munich -- History -- 20th century
- Hockey + History -- 20th century
- Popular culture + History -- 20th century -- Periodicals
- Carmel (Calif.) -- History -- 20th century
- Environmental protection -- Wisconsin -- Citizen participation -- History -- 20th century
- Circus performers -- 20th century -- Biography
- Jews -- Netherlands -- Social conditions -- 20th century
- Generals + History -- 20th century
- Childbirth -- England -- London -- History -- 20th century
- Telephone operators + History -- 20th century
- Authors, French -- 20th century
- Germany -- Politics and government -- 20th century
- Cabinet officers + History -- 20th century
- United States, Navy -- History -- 20th century
- Baseball + History -- 20th century
- Intervention (International law) + History -- 20th century
- Nuclear warfare + Government policy + History -- 20th century
- World politics -- 20th century
- Tornadoes -- Illinois -- History -- 20th century -- Fiction
- United States, Army -- Officers -- History -- 20th century
- Mooreland (Ind.) -- Social life and customs -- 20th century
- Atomic bomb + Government policy + History -- 20th century
- Sydney (N.S.W.) -- History -- 20th century -- Fiction