Per the question regarding Daniel Nichols grave. Yes, and No. I was gifted a sheet of paper that listed the graves in a Monroe Cty cemetery... which included Daniel Nichols. As you might think, I was truly excited! Since that day I have not been able to find that one sheet of paper for the life of me. I'm hoping that it will turn up, and when it does, I'm scanning it into my computer. So, Yes, I did have it, but No, I no longer do.
As for photos of Henry R & Mary Nichols graves, I do not. However, I often visit the area and think I need to take the camera with me next time I'm there. I just came into possession of a gold mine of Thurston, Nichols, and Gahler photos. I'm hoping for one better than a tombstone; their actual photos. Please forward your email if you're interested in photos.