CORN AND HOG CORRELATIONS 
3 
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Fig. 1.— The acreage of corn in the United States, 1870 to 1915. The dotted line is the estimaterof the 
trend which has been used in measuring the annual fluctuations 
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Fig. 2.— The average yield of corn per acre in the United States, 1870-1915, with an estimate of the trend 
