Barbier et al. 2011. Fig. 2.

Barbier, E.B., S.D. Hacker, C. Kennedy, E. W. Koch, A.C. Stier, and B.R. Silliman. 2011. The value of estuarine and coastal ecosystem services. Ecological Monographs 81:169-193.

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Taken on May 17, 2011