?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Lange&rft.aufirst=C.+de&rft.au=Lange%2C+C.+de&rft.title=Het+Ruhrgebied%2C+Een+regio+bekent+kleur&rft.degree=Master&rft.date=2006