Standards - Books - 2020 - Robert den Broeder - Marc Beijen - Gabor Vis van Heemst - Gert-Jan Vlasveld - Hans Fredriksz - Ron Seegers

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Standards - Books - 2020 - Robert den Broeder - Marc Beijen - Gabor Vis van Heemst - Gert-Jan Vlasveld - Hans Fredriksz - Ron Seegers - Dolf van der Haven