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[Subject: Postal Communication]
Translated by: JUAN GOMEZ ESCOBAR
Translated in 58 languages
Translated in 17 languages
Translated in 16 languages
[Subject: Generalities]
Translated in 12 languages
Translated in 10 languages
[Subject: Mechanics]
[Subject: Precision & Other Instruments]
Translated in 9 languages
Translated in 8 languages
Translated in 5 languages
Translated in 3 languages
[Subject: Architecture]
[Subject: Relation Of Natural Factors]
Translated in 2 languages
[Subject: Electricity & Electronics]
[Subject: Military Art & Science]
Translated in 1 languages