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A Global Perspective on Trends in Nature-Based Tourism
Balmford A,
Beresford J,
Green J,
Naidoo R,
Walpole M,
et al.
(2009)
A Global Perspective on Trends in Nature-Based Tourism.
PLOS Biology 7(6): e1000144.
https://doi.org/10.1371/journal.pbio.1000144