My grandfather (from Czechia, cca years 1970-1990) kept daily notes of what he bought and did each day (he somewhat obsessively quantified himself before it was cool). I think these could be interesting to a historian, but they're written in pencil and kinda hard to read/decipher. I don't think technology is advanced enough for automated extraction yet.
if you don't plan to profit from it, you can just scan it and publish as is. If it is of interest for historians they will convert it into data themselves (if you are tech guy you can help them cooperate)
It most certainly is, give a junior machine learning enthousiast a week and I bet they could have the entire thing OCR'ed, if off-the-shelf tools don't work.
