When looking through the 178 "Birch" images at Acclaim Images.com this Abstract Image of Birch Trees in the White Mountains of New Hampshire in October was a favorite.
All of their pictures are hand picked, availiable in a number of formats, and you can even get custom prints and posters.

Description:
Abstract Image of Birch Trees in the White Mountains of New Hampshire in October
Photograph of Birch Trees in the White Mountains of New Hampshire Taken While Vertically Panning the Camera.

Some related terms for more images:
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