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- Archives3
- Azaña, Manuel, 1880-19401
- Babeuf, Gracchus, 1760-17971
- Catalogs1
- Collected works1
- Communism8
- Democracy1
- Dialectical materialism2
- Equality1
- History19
- International Institute of Social History2
- Labor1
- Labor movement3
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- Labour and Socialist International1
- Liebknecht, Wilhelm, 1826-19001
- Partito socialista democratico italiano. Direzione nazionale1
- Partito socialista italiana. Direzione nazionale1
- Politics and government1
- Social history2