from Chapter II of Spatial Analysis of Ecological Factors Related to Grasshopper Population Dynamics in Wyoming
Fig. 2. Regions of interest with respect to grasshopper outbreak distribution (blue = Northern Powder River Basin; light violet = Black Hills; orange = Platte-Goshen-Niobrara Complex; purple = Laramie Mountains; magenta = Southern Big Horn Mountains; green = Midwest and Thermopolis regions; yellow = Southern Powder River Basin; light blue = Laramie-Cheyenne Plains; black = state and county borders).
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