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[Subject: Education]
Translated by: FERRAN ISABEL I VILAR
Translated in 128 languages
[Subject: Generalities]
Translated by: JUAN GOMEZ ESCOBAR
Translated in 22 languages
[Subject: Biology]
Translated in 12 languages
[Subject: Electricity & Electronics]
Translated in 11 languages
[Subject: Military Art & Science]
Translated in 4 languages