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- 1917-19601
- 1961-20003
- 20th century1
- 21st century1
- A priori2
- Abdullaeva, Z. K.1
- Abelard, Peter, 1079-11421
- Abnormalities, Human, in literature1
- Abrahamic religions1
- Abramov, I︠U︡. A. (I︠U︡riĭ Andreevich)1
- Absolute, The7
- Abstraction1
- Absurd (Philosophy)3
- Absurd (Philosophy) in literature14
- Abuse of rights1
- Academicians. Scholars. Savants1
- Achkasov, V. A.1
- Acmeism1
- Acoustics and physics1
- Acquisition1