My wife and I came across a bunch of these trees while at Valley Forge National Park in eastern Pennsylvania and are trying to figure out what kind of tree it is. What we found interesting was the bark on to top edges of the tree were white. We also noticed they were late to blue as other trees in the area already have fresh leaves on them.

here is a pic of it, if you look you can see the white bark on it. There is another of the same tree on the right side of the train and a bunch in the back ground.

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