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[Subject: Light & Paraphotic Phenomena]
Translated by: PEZZUOLI CLAUDIO
Translated in 167 languages
[Subject: Generalities]
Translated by: KATRIN HELD
Translated in 13 languages
Translated by: GUEST USER
Translated in 9 languages
Translated in 7 languages
[Subject: Precision & Other Instruments]
Translated in 3 languages