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. 2013 Nov 27;8(11):e81391. doi: 10.1371/journal.pone.0081391

Figure 2. Study area and sample plots.

Figure 2

The study area is defined by the political boundaries of Colorado and Wyoming and includes 375 randomly selected, 1-km diameter sample plots, stratified by wind energy, oil and gas, and other/underlying land-uses (reference stratum).