The YouTube video linked in reference 11 has been taken down, but I found it on the Internet Archive: https://web.archive.org/web/20200626032839/https://www.you

The YouTube video linked in reference 11 has been taken down, but I found it on the Internet Archive: https://web.archive.org/web/20200626032839/https://www.youtube.com/watch?v=Y2jiQXI6nrE&feature=youtu.be https://web.archive.org/web/20200626032839/https://www.youtu... I've just watched it, and it was very interesting (though a low quality copy). From 1966, it has many people who knew him talking about him.