TU Delft Library
... that the roof of the TU Delft Library is used as a sledding hill during the winter?
... that the roof of the <b id="mwAV8"><a href="./TU_Delft_Library" id="mwAWA" rel="mw:WikiLink" title="TU Delft Library">TU Delft Library</a></b> is used as a sledding hill during the winter?