It’s common knowledge around here and has been spoken of repeatedly for quite some time. I’m not going to do your research. It’s all here if you just look.
So if you get 100 people to keep saying the same unproven non-verified claim, suddenly you get ‘common knowledge’? Sounds more like lemming-ism to me.
You have a 47 year old written record vs some neighbors who ‘dont remember’ something happening 47 years ago. Well. Maybe they just forgot.