This archive contains all of the raw data ever taken with the Westerbork Synthesis Radio Telescope (WSRT), an aperture synthesis telescope of 14 antennas of 25-m diameter in The Netherlands. The data are physically stored on tapes at the Netherlands Foundation for Radio Astrononomy (NFRA), Dwingeloo, The Netherlands. The observation log contains 78,000 entries as of April 1993 and is searchable on-line with the same software, ARCQUERY, as for the La Palma archive (see §3.3.13.). Access is via telnet to rzmvx1.nfra.nl (192.87.1.100), login as arcquery. For further information contact E. Raimond at (exr@nfra.nl). [References: Raimond (1991, 1994), Zuiderwijk et al. (1994).]