The book "A Texan Looks at Lyndon" came out in the 1960's and gave this information for all who were interested. Only Conservatives knew about it. The information would still destroy the Democrat Party. Therefore, it will not come out in the "Good Ole USofA".
I have an original copy of this book. The front page is stamped with the address information for the Barry Goldwater campaign. It's very compelling reading.
I think it was "Landslide Lyndon" all along.