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

3C 345: THE HISTORICAL LIGHT CURVE (1966-1991) FROM THE DIGITIZED PLATES OF THE ASIAGO OBSERVATORY