Welcome to the forum! I own some land in Dade and have done a little bit of research on the area. The site Gypsy gave you is a good one. Here's some more that I have saved to my favorites.
If you can find a copy of "Goodspeeds History Of Dade County MO" you can get a lot of info from it. I have Goodspeeds History for Lawrence and Greene and love it.
Thank you bothe for the info it sure looks like there is a lot of history here and I have probably have a lot of good places to explore when I finally do get a detector thanks again and happy hunting