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<br />a <br />"':l" <br />00 <br />C\.l <br /> <br />atmosphere, however, the effects of frost on vegetable life are apt <br /> <br />to be more severe. The Rifle weather station was located on the <br /> <br />edge of a high mesa overlooking the river, where the air drainage <br /> <br />should operate against the danger of frost. <br /> <br />How successfully all crops, and especially the less hardy <br /> <br />ones can be grown on the project, depends in the last analysis on <br /> <br />such purely local influences as the direction of exposure and on <br /> <br />the direction and persistence of air c~ainage which are the nost <br /> <br />important factors bearing an frost occurrence. <br /> <br /><:, <br /> <br />~~ <br /> <br />,0" <br /> <br />~ <br />, -,~ <br />~ <br />~~. <br />-:1 <br /> <br />-"'. <br /> <br />"'1 <br />::>; <br /> <br />17 <br /> <br />-, <br />, <br />