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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />rt, 1'f"~ 51'10 <br />V,-;J~ JJ <br /> <br />% of 1967 <br />120 <br /> <br /> <br />Hand power <br /> <br />100 <br /> <br />Civil War <br /> <br />80 <br /> <br />II <br />II <br />I I <br />I I <br />d <br />II <br />II <br />I I <br />........~t11 <br />. ..... <br />..... I I <br />..0.... <br />............ 1 I <br />II <br />'II <br />I I <br />II <br />Will <br />1850 <br /> <br />130 <br /> <br />40 <br /> <br />20 <br /> <br /> <br />o <br />1775 <br /> <br />1800 <br /> <br />1825 <br /> <br />Horse power <br /> <br /> <br />I II <br />1875 <br /> <br />. <br /> <br />I I, <br />1900 <br /> <br />I I <br />Mechanical <br />I power I <br /> <br />WWI WWII <br />II I I <br />II I I <br />I I I <br />I I I. <br />II I <br />I , . I <br />I I ;'. I I <br />. . I <br />.1 <br />! <br />I I <br />I I <br />I I <br />I I <br />I I <br />I I <br />I " III <br />1950 <br /> <br />. .- <br />. <br />II' <br />II <br />II <br />II <br />I I <br />I I <br />II <br />II <br />I I I , I <br />1925 <br /> <br /> <br />I I I <br />1975 <br /> <br />Figure 11-3 ~ U.S. Agricultural Productivity Growth From 1775 to 1975 <br /> <br />Source: U.S. Department of Agriculture <br /> <br />II-ll <br /> <br />Arthur D Little, Inc. <br />