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<br />exp0rimentation over a period of years, under conditions <br />that pGr~lit scientifically adequate obsorvation, may be <br />required to establish the deGree of success which cloud- <br />seeding operations flay be expected to achieve. <br /> <br />< <br /> <br />~ <br /> <br />~ <br />~ <br /> <br />~ <br /> <br />iv <br />