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[Subject: Relation Of Natural Factors]
Translated by: MIRJAM BRÜCKNER
Translated in 108 languages
[Subject: Political Science]
Translated by: CLAUDIA GIERSBERG
Translated in 65 languages
[Subject: Generalities Of Education]
Translated by: PEZZUOLI CLAUDIO
Translated in 33 languages
[Subject: Generalities]
Translated in 18 languages