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[Subject: Mechanics]
Translated in 9 languages
[Subject: Applied Mechanics]
Translated in 8 languages
[Subject: Light & Paraphotic Phenomena]
Translated in 6 languages
[Subject: Ground Transportation]
[Subject: Electricity & Electronics]
Translated in 5 languages
[Subject: General Technologies]
Translated in 4 languages
[Subject: Railroad Transportation]
Translated in 2 languages