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Am 9:13 y bore Gwener hwnnw, disgynnodd miloedd o dunelli o wastraff glo ar Ysgol Gynradd Pantglas a rhannau eraill o'r pentref gan ladd 116 o blant a 28 oedolyn.

School exercise book used by Marylyn Minett in Aberfan. Marylyn was ten years old when she was killed in her classroom in Pantglas Junior School Aberfan on 21 October 1966. Her seven-year-old brother, Carl, was also killed in the disaster. The school exercise book (missing its cover) includes short essays and other English grammar exercises written by Marylyn. One page has an outline of Marylyn's hand.

At 9:13 that Friday morning thousands of tonnes of black coal waste from an unstable tip slid down the mountain. It instantly engulfed Pantglas Junior School and parts of the village killing a total of 116 children and 28 adults.