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(31) Wallace, Errett, and Evans, L. H. 
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Dept. Agr., Farmers' Bui. 994, 11 p., 1 fig. 
(32) Yothers, W. W. 
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Florida. U. S. Dept. Agr., Farmers' Bui. 933, 39 p., 24 fig. 
i 
