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<br />PARTICIPATING AREAS <br /> <br />The South Dakota Weather Modification Program began in <br />1972 and has been conducted during the months of May, <br />June, July and August each year since. Both hail suppres- <br />sion and rain increase activities were conducted over <br />those counties shown on the maps below. <br /> <br />"I <br /> <br />1972 <br /> <br />( <br /> <br />26 Counties <br /> <br />17,181,000 Acres <br /> <br />~ <br /> <br />~ <br /> <br />. <br /> <br />( <br /> <br />1973 <br /> <br />42 Counties <br /> <br />26,612,000 Acres <br /> <br />. <br /> <br />1974 <br /> <br />w <br /> <br />46 Counties <br /> <br />2iiI <br /> <br />~ <br /> <br />29,547,000 Acres <br /> <br />~ <br /> <br />~ <br />~ <br /> <br />8 <br />