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261. Wheatgrass. Crested wheatgrass; [by H. L. Westover and George A. Rogler].

264. Blister rust. White pine blister rust disease.

265. Blue mold control in tobacco beds; [prepared by Edward E. Clayton].

266. Caterpillars. Eastern tent caterpillar; [by F. M. Wadley].

267. Cattle. Dairy cattle breeds; [by Amer B. Nystrom].

270. Cowpeas, culture and varieties; [by W. J. Morse].