I have recently read a great book by Louise Samways called "The Dangerous Persuaders" which deals with these issues, and even mentions Landmark, EST etc. I don't know if anyone else has read it, because it is an Australian book, and is sadly now out of print (highlighting the general level of public apathy over this subject if it doesn't directly affect them)
However, a quick
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Large Group Awareness Training, "Human Potential"