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<br />CONTENTS <br /> <br />Abstract . . <br /> <br />Introduction <br /> <br />Data base <br />Summary of data <br />Number of activities <br />Operators and sponsors <br />Target areas and their locations <br />Purp9se of activity .... <br />Techniques and apparatus . . . . <br />Seeding agents and dispensing rates . <br />Summary of reported data for 1979. ...... <br />Safety and environmental factors . . . . . . . . <br />Federal activities <br />Nonfederal activities . . . . . <br /> <br />. ~. . <br /> <br />Comparison of data reported since 1973 <br />Number of activities ........ <br />Operators and sponsors <br />Target areas and locations . . . . <br />Duration of modification activities . <br />Seeding agents . . . . <br />Concluding remarks <br />Reference .......... <br /> <br />Appendixes <br /> <br />A, Public Law 92-205 . . . . <br />B, Reporting rules <br />C-l, Initial report . . <br />C-2, Interim/final report . . . . . <br />C-3, Daily Log form . . . . . . . . . . <br />D, Weather modification activity reports <br /> <br />ii <br /> <br />. .. .. . <br /> <br />Page <br /> <br />1 <br /> <br />1 <br /> <br />3 <br />3 <br />3 <br />4 <br />5 <br />7 <br />7 <br />8 <br />9 <br />10 <br />10 <br />10 <br /> <br />13 <br />13 <br />13 <br />13 <br />14 <br />14 <br />14 <br />15 <br /> <br />17 <br />19 <br />23 <br />25 <br />27 <br />29 <br /> <br />~I <br />1 <br /> <br />.1 <br />