A group of former employees of Nozema, which was formerly responsible for the technical distribution of radio signals in the Netherlands, has set up a website called the Omroep Zender Museum (Broadcast Transmitter Museum) that has many photos of broadcast facilities in the Netherlands since Nozema was set up in 1935. There is also some audio - including the final moments of RNW shortwave transmissions in English and Dutch from Flevo. A search engine has just been added to the site, though at the moment it is only in Dutch.
(Source: R Netherlands Media Network Weblog)