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NSF:10.2111/1551-501X-33.3.33
NSF:10.2111/RANGELANDS-D-10-00031.1
NSF:10.2111/RANGELANDS-D-10-00072.1
NSF:10.2111/RANGELANDS-D-13-00034.1
NSF:10.2111/RANGELANDS-D-13-00035.1