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Science 27 July 2007:
Vol. 317. no. 5837, pp. 438 - 439
DOI: 10.1126/science.317.5837.438b
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News of the Week

ECOLOGY:
Aspens Return to Yellowstone, With Help From Some Wolves

Virginia Morell

To grow a healthy stand of aspen trees, you need a pack of wolves. That's the conclusion of two researchers who have been studying aspens in Yellowstone National Park.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)