birch dieback disease
... that in 1951, birch dieback disease was estimated to have killed two thirds of the birch trees in Maine?
... that in 1951, <b id="mwA7Q"><a href="./Birch_dieback" id="mwA7U" rel="mw:WikiLink" title="Birch dieback">birch dieback disease</a></b> was estimated to have killed two thirds of the <a href="./Birch" id="mwA7Y" rel="mw:WikiLink" title="Birch">birch trees</a> in <a href="./Maine" id="mwA7c" rel="mw:WikiLink" title="Maine">Maine</a>?