6 massive ufo's parked on moon. old sighting

I was using a high power telescope (somewhere between 320-360 power) and was scanning down the terminater band on the moon when it was just a sliver, maybe just a couple hours away from a new moon. At this magnification and with the light hitting the moon at this extreme angle, terrain features stood out in vivid detail, shadows visibly moving by the second, but the field of view slid by completely within 30 seconds or so.
In a valley about 2/3 down the sliver of light I saw 6-7 massive disks hanging absolutely motionless in the "air" within the valley, casting individual shadows against the mountain walls behind them. They had to be miles across to be seen at that distance, were brilliant reflective silver, totally featureless, and were arrayed near the walls at various heights from the valley floor. I observed them for about 20 minutes until the shadowline advanced over the valley and the objects dissappeared in the darkness.
Date is approximate.  Please see NASA article about anomalies seen on, or near, the Earth's moon, edited by noted astronomer, Barbara M. Middlehurst, published in July 1968.  PD