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FIG. 82. Left. Black walnut trees in J. Russell Smith's fence corner, grafted to Stabler black walnut, have borne several crops. (Photo J. Russell Smith.)—Fig. 83. Center. Fruit cluster of a Japanese walnut. (Courtesy J. F. Jones.)—FIG. 84. Right. Cluster of cork oak trees occupying rocky knoll in Portuguese wheat fields. Typical of a method of land utilization that might produce nearly all the nuts needed in America, leaving other crop area unaffected.
