Try this site.
http://londonjazzcollector.wordpress.com/2014/07/24/guest-post-how-they-heard-it-blue-note-records-and-the-transition-from-mono-to-stereo/
http://londonjazzcollector.wordpress.com/2014/07/24/guest-post-how-they-heard-it-blue-note-records-and-the-transition-from-mono-to-stereo/