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[Subject: Mechanics]
Translated by: GIBELLINI MORGAN
Translated in 33 languages
Translated by: MARCO PRADELLI
Translated in 22 languages
[Subject: Psychology]
Translated by: DAVID LAURENT
Translated in 17 languages
[Subject: Generalities]
Translated in 15 languages
[Subject: Music]
Translated in 12 languages
[Subject: Social Problems & Services]
Translated by: SIBILLA CUOGHI
Translated in 72 languages
Translated in 47 languages