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Let's try again. Also, there's a lot more to our lunch with PB than here. More later:
Peter is quite an authority on infrasound. He has studied infrasound use by elephants in various controlled areas {zoo's}. While I can not speak for PB, I think that ultrasound can probably be used on certain frequencies to communicate with one human; and / or to monitor that human.
Specifically, a part native -American friend of mine has told me several times, in different contexts, that once "you" are connected with Sasquatch, they know when you leave home to go to the mountains. There's a lot more to this topic, but as far as I know, Mr. Peter Byrne was a pioneer in While I may be misspelling it, he wrote a book on a huge Nepal elephant, Tula Hati in which this topice was referred to, but not directly addressed.
Also, I just bought a copy of Peter's first book directly from him last week. It is in only fair condition with a dust jacket {3 on a scale of 10}. It was signed by Peter and has a note in the after pagers about how he wrote it in The Dalles. $100 was my price and same to anyone on the list. I will allow shipping and insurance. joebeelart@comcast.net Peter at 92, was in good health, cordial, and fun; as usual. Also, not to worry, I have all of his 18 books signed, and several extra copies, so this is not a loss to me. From near Portland, Oregon, I remain yours Sasquatchedly, Joe Beelart. Ps: Hopefully soon, "Honoria Sasquatchian" pins available. To be a "Clackamas Sasquatchian" there are requirements so far only met by 21 people {mainly you have to be on site over 200 hours}. The photo is Mt. Jefferson in the eve before a Pacific storm. I manage to stay dry that howling night with only a tarp. {Have some experience in USMC, etc. and fortunately was alone only 15 miles from a "well" used road.