The role of VGI and PGI in supporting outdoor activities.

@article{Parker2013TheRO,
  title={The role of VGI and PGI in supporting outdoor activities.},
  author={Christopher J. Parker and Andrew J. May and Val Mitchell},
  journal={Applied ergonomics},
  year={2013},
  volume={44 6},
  pages={
          886-94
        }
}

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