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Aerial Assault: Dead and Dying Ash Trees Pose Hazard from Above
12 Different Types Of Pennsylvania Native Trees - Tree Vitalize
dying ash trees - Ask Extension
Extraordinary Tree Inventory Project - Montgomery County, PA
From the Woods: American Chestnut - Penn State Extension
Beech Leaf Disease is killing trees in Pennsylvania and N.J.
The Ash Tree Catastrophe in Pennsylvania - Executive Tree Care
Trees Dying - Ask Extension
Pennsylvania’s forests face looming threats, researchers say - WHYY
Sudden oak death case causes worries in Pennsylvania