I don't know how a 100' elm can not be "found" for over a century but look what turned up on land just purchased by the state. Its care to prevent DED is also interesting. This was found around Dayton.
http://www.daytondailynews.com/news/dayton-news/giant-surviving-elm-tree-gets-special-treatment-751272.html
http://www.daytondailynews.com/news/dayton-news/giant-surviving-elm-tree-gets-special-treatment-751272.html