Πίσω στο σχολείο. Επιστημονική και εκπαιδευτική έννοια. Ήταν ένα μικρό πείραμα χημείας. Πείραμα. Εργαστηριακό μικροσκόπιο και δοκιμαστικοί σωλήνες. - Φωτογραφίες & Εικόνες Αρχείου

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