Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13021-018-0095-3/MediaObjects/13021_2018_95_Fig4_HTML.png)
Distribution of managed and unmanaged land in the United States. The gray areas are unmanaged and the blue areas are managed
Distribution of managed and unmanaged land in the United States. The gray areas are unmanaged and the blue areas are managed