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/ ehrh -- eim / 00245
- OCR-text (abbyy)
E^chenval'd, A A Akustika i optika.(Konspekt lekcij.) izdanie tret'e. 8:o Moskva 1921.
- OCR-text (abbyy-crop)
Eichenval’d, A A Akustika i opt ika. (Konspekt lekcij.) IZdanie trefe. 8:o Moskva 1921.
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