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<br />.. <br /> <br />\ <br />.. <br />/ <br /> <br />4000- -- --- <br /> <br />3000--- --- <br /> <br />2000------ <br /> <br />1000------ <br /> <br />0000------ <br />1900 <br /> <br />1910 <br /> <br />1920 <br /> <br />FIGURE IV A <br /> <br />" <br /> <br />.. <br /> <br />BASALT POPULATION PROJECTION <br /> <br />1930 <br /> <br />1940 <br /> <br />1950 <br /> <br />1960 <br /> <br />" <br /> <br />,. <br /> <br /> <br />1970 <br /> <br />1980 <br /> <br />1990 <br /> <br />< <br />t <br />a.. <br />