I too have numerous books, newspaper articles and magazine articles re: the Sultana. I have some INdiana 9th Cavalry and Cahaba prison information. YOu asked about survivor meetings. There were several groups. My Henry Kline from the Blackford/Grant Co., IN area was I believe the last survivor of the Indiana/Ohio group which met every year. I have a picture of the Sultana Survivors Association- April 27, 1865. It is not a very good picture and do not know where the original came from.