Friends have night sighting above Sonora witnessed in Tuolumne County, California

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On or about oct.25th 1983, a friend and myself went to look at a three wheeled motorcycle from an ad above Sonora, CA. We arrived in late afternoon, met the lady that wanted to sell it. We entered a fenced area w/a large gate. The area was about thirty feet across [hard packed red clay], w/ an old shed to the right against some manzanita brush. To the right was a trail through the brush leading to a cabin [unoccupied for years] and unfinished. It was built against the side off a hill where you could walk into it from the trail but when you looked out the window off the main room it was about a forty-foot drop [it was partially on stilts] to the ground. I am an outdoors person, hunter, fishing, hiking, etc., but I didn't feel good about this place. We had trouble starting the trike and I recommended leaving it, but my friend wanted it badly and the lady persuaded him to stay the night in the cabin and she would rent a trailer the next day. We went to Sonora for dinner and came back abou...