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C. Rasmussen, Lybrand, R. A., Orem, C., Kielhoffer, J., and Holleran, M., Western Range and Irrigated Land Resource Region, in The Soils of the USA, Cham Springer, 2017, pp. 115-130.
B. M. Rau, Johnson, D. W., Blank, R. R., Tausch, R. J., Roundy, B. A., Miller, R. F., Caldwell, T. G., and Lucchesi, A., Woodland expansion’s influence on belowground carbon and nitrogen in the Great Basin U.S., Journal of Arid Environments, vol. 75, no. 9, pp. 827 - 835, 2011.
J. Reimer, Water in the international economy, Journal of International Agricultural Trade and Development, vol. 1556, p. 21, 2014.
D. A. N. I. E. L. P. REINKENSMEYER, Miller, R. F., Anthony, R. G., MARR, V. E. R. N. E., and Duncan, C. M., Winter and Early Spring Bird Communities in Grasslands, Shrubsteppe, and Juniper Woodlands in Central Oregon, Western North American Naturalist, vol. 68, no. 1, pp. 25 - 35, 2008.
J. D. Rigas, Montilla, H. J., Tornquist, S. J., Valentine, B. A., and Kutzler, M. A., What is your diagnosis? Equine ovarian cyst fluid, Veterinary Clinical Pathology, vol. 4193371863124, no. 3, pp. 435 - 436, 2012.
N. R. Rimbey, L. Torell, A., and Tanaka, J. A., Why Grazing Permits Have Economic Value, Journal of Agricultural and Resource Economics, vol. 32, no. 1, pp. 20-40, 2007.
W. J. Ripple, Painter, L. E., Beschta, R. L., and C. Gates, C., Wolves, Elk, Bison, and Secondary Trophic Cascades in Yellowstone National Park, The Open Ecology Journal, vol. 3, no. 1, pp. 31 - 37, 2014.
J. T. Romo and Haferkamp, M. Roy, Water Relations of Artemisia tridentata ssp. wyomingensis and Sarcobatus vermiculatus in the Steppe of Southeastern Oregon, American Midland Naturalist, vol. 121, no. 1, p. 155, 1989.
S. I. Rondon and Corp, M. K., The wheat head armyworm and its relative in eastern Oregon, 70th annual Pacific Northwest Insect Management Conference. Pacific Northwest Insect Management Conference, Portland, Oregon, p. 35, 2011.
S. I. Rondon, Corp, M., Roberts, D., Pike, K., Landolt, P. J., and Keys, D., Wheat Head Armyworm, true or false: a tale from the Pacific Northwest, Oregon State University Extension Service, Corvallis, Oregon, EM9000-E, 2009.

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