Now and then: Photographs document habitat changes in Western forests

In the summer of 1968, the U.S. Forest Service sent wildlife biologist George Gruell into the forests of northwestern Wyoming with a camera, a tripod and an old photograph.

His assignment: Find the exact spot where the photo was taken — and take it again.

Gruell had some old field notes and the vague recollections of a few locals to guide him. That got him fairly close. He walked around holding the photo up to the horizon, comparing it to the scene before him. When he got it just right, he took a photograph of the new scene.

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