1. Volume 18, Issue 4, Pages R136-R137 (February 2008)
Backs to nature 
Nigel Williams 
Current Biology 
Volume 18, Issue 4, Pages R136-R137 (February 2008)
DOI: /j.cub
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2. Lonesome trail: Americans appear to be spending less time visiting the country's national parks and wilderness areas, to the concern of conservationists. (Picture: Photolibrary.)
Current Biology  , R136-R137DOI: ( /j.cub )
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