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Students learn about the many factors which contribute to the accuracy of an hourglass.
About this resource
لِکِکال
چرکن کيکالا
جواز/ چاپس حق دارکاليى
CC 0 / public domain
منابع بازافغانستان آنتې چلوي او اندو ياده کينيس شِراونچې
