Hi, I appreciate your problem, and don't have much information. Finding a death cert for anyone before 1900 is unlikely, and confirmed by your lack of success. Did you look for an obit? You might be able to get some newspapers on microfilm via interlibrary loan, and there are many obits extracted at the genealogy library in Carmi. Did you have any luck there? Do you have any idea what part of the county your ancestors lived in? The Adams name reminds me of the Union Ridge area, but its not a big part of any of my family trees. Contact me if you are still looking.