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<br />} AWARENESS AND IMPLEMENTATION <br />OF <br />FISH CONTROL PROGRAMS <br />IMPLEMENTATION <br />1900 - 1910 ............... AWARENESS <br />.............. <br />............... <br />.............. <br />1911 - 1920 <br /> <br />1921 - 1930 <br />0 1931 - 1940 <br />w <br />1941 - 1950 <br />................................. <br />1951 - 1960 ......................................................, <br />....................................................... <br />....................................................... <br />1961 - 1970 <br />r <br />1971 - 1980 <br />0 5 10 15 20 25 30 35 40 45 <br />PERCENT OF ALL RESPONSES <br />SOURCE: 1987 RESPONSE OF STATES AND <br />CANADIAN PROVINCES <br />O