Πίσω στο σχολείο. Η κόρη ψάχνει στο μικροσκόπιο. φοιτητής κάνει επιστημονικό πείραμα με μικροσκόπιο στο εργαστήριο. Μικρό αγόρι που χρησιμοποιεί μικροσκόπιο στο μάθημα του σχολείου. Ένα μικρό αγόρι στην επιστημονική κατασκήνωση. Σύγχρονο σχολείο. - Φωτογραφίες & Εικόνες Αρχείου

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