Building De Heuvel 1959-2009, a very Rotterdam buildingYouth Land North is now a residential neighborhoodPretensions on Polder Road; the legacy of the East Gas PlantYouth requires space to live and play : report of the 14th national youth work conference, organized by the Groninger Youth Council under the auspices of the Dutch Youth Community and held on Friday, April 5, 1963 at the Concerthuis in Groningen