You can either download the .ggb file alone or the complete webpage for students with tasks.
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Serlo Education — April 28, 2016 - 11:55 AM
January 29, 2017 - 1:47 PM 3 resources — chmo
August 18, 2016 - 12:11 PM 85 resources — serlo.org
September 5, 2019 - 6:59 AM 31 resources — Christian Conradi
