Appendix S1: Study areas.

Appendix S2: Details of how the costs of community and scientist-collected forest condition data were calculated.

Appendix S3: Cost (over 4 years in USD) of community and expert-executed measurements of biomass and forest utilization.

Blomley, T., Ramadhani H. (2006) Going to scale with participatory forest management: early lessons from Tanzania. Int For Rev8, 93--100.

Somanathan, E., Prabhakar R., Mehta B.S. (2009) Decentralization for cost-effective conservation. Proc Natl Acad Sci USA106, 4143--4147.

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