Hance, R. J. Paraquat persistence-statistical analysis of the W.R.O long term trial - ed. rev. - Oxford : Weed Research Organization, 1985 - [21 p.] ; gráfs. - Technical report : 73 . - Technical report : 73 . 26-220 LCCN: 68088 Subjects--Topical Terms: Herbicidas.Paraquat.