All you can do is flood the net with queries. Surnames of Cotton, his wife's surname, locations everyplace he lived and was born), etc and hopefully you will run across someone. Your only hope is finding someone from Robert's line that has researched the family and has info and maybe you could be so lucky to find a bible record. I tried checking the land abstracts that IGHS has to see if by chance he left any record. No luck only William K. did. Good Luck Granny