Wu, Xinyi, Spencer A. Wood, David Fisher, and Greg Lindsey. “Photos, Tweets, and Trails: Are Social Media Proxies for Urban Trail Use?”. Journal of Transport and Land Use 10, no. 1 (October 10, 2017). Accessed April 23, 2024. https://www.jtlu.org/index.php/jtlu/article/view/1130.