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Fig. 2-2. Locations and classification of counties where plants were collected for Se analysis (adapted from Kubota et al., 1967). Vertical lines, X's and <br />solid dots indicate counties where more than one-half of the crops sampled contained <0.1, >0.1, or where Se-accumulator plants (data on forages and ~ <br />grains were unavailable) contained > 50 mg Se/kg, respectively. <br />