Spatial and Temporal Dynamics and Value of Nature-Based Recreation, Estimated via Social Media Sonter, Laura J. ; Watson, Keri B. ; Wood, Spencer A. ; Ricketts, Taylor H. Abstract Publication: PLoS ONE Pub Date: September 2016 DOI: 10.1371/journal.pone.0162372 Bibcode: 2016PLoSO..1162372S