The Wide-Field Plate Database (WFPDB_) contains the descriptive information
for the astronomical wide-field (>1°) photographic observations stored in
numerous archives all over the world. The total number of these
observations, obtained since the end of the 19th century with more
then 200 instruments (telescopes) is about 2 550 000 from 509 archives.
The WFPDB is continually being updated, providing currently access to the
information for about 640 000 plates from 117 plate archives (30% of the
estimated total number of wide-field plates)
.. _WFPDB: http://www.skyarchive.org/
