A very lengthy list, but I was only familiar with a very small percentage of them.
I would estimate that there were only about 15 jazz musicians and maybe 7 or 8 classical musicians on the list.
The closest I could find were these two. Though not the exact same line up of musicians as in the photo.
JATP In London 1966 - Pablo
JATP All Stars - Pablo
I remember long ago watching Hawkins on a PBS station filmed in Chicago not long before he died. He was in very bad condition, and it was somewhat painful to watch him struggling so much. I have little memory of who was in the group, though am guessing Roy Eldridge and Barry Harris.