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1997
S. O. Wotring, Palmquist, D., Young, J., and Svejcar, T., Perennial pepperweed (Lepidium latifolium) rooting characteristics, Management of Perennial Pepperweed (Tall Whitetop). Agricultural Experiment Station, Oregon State University, Corvallis, OR, USA. Special Report, vol. 972, pp. 14–15, 1997.