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H.-J. Elschenbroich. GeoGebra Institut NRW — September 19, 2017 - 6:17 PM
March 24, 2018 - 6:26 PM 21 resources — SAVASORHAN
March 1, 2020 - 3:44 PM 15 resources — elschenbroich
October 7, 2025 - 5:30 PM 40 resources — Roman
