  In the frame of a large project to digitize the plate archives of the Italian
and Vatican Astronomical Observatory, we have already performed the
digitization of all available plates of the field of 3C345. The plates,
approximately 100, were taken with the three telescopes of the Asiago
Observatory (122 cm, 180 cm, 67/90 Schmidt Telescope) in the period from 1966
to 1991. Many of them were not analyzed till now, so we present here
essentially new data about the variability of 3C 345 and also of other six
quasars in the same field, in that period.
