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D. E. Johnson, Johnson, M. D., Harris, N. R., Louhaichi, M., and Ganskopp, D. C., “KRESS Modeler Version 1.12 User’s Manual”, The KRESS Project. Department of Rangeland Resources, Oregon State University, Corvallis, OR, 2004.
D. E. Johnson, Vulfson, M., Louhaichi, M., and Harris, N. R., “VegMeasure Version 1.6 User’s Manual”, VegMeasure Project. Department of Rangeland Resources, Oregon State University, Corvallis, OR, 2003.
D. E. Johnson, “Surveying, mapping, and monitoring noxious weeds on rangelands”, in Biology and management of noxious rangeland weeds, Corvallis, OR: Oregon State University Press, 1999, p. 438.