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      <marc:subfield code="a">"CIR 3768."</marc:subfield>
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      <marc:subfield code="a">"This technical report describes observed ice conditions with regard to ice coverage, age, topography, puddling, snow cover, ice of land origin, and water features over the described area during the period January 6, 1962 to June 27, 1962"--Page (ii).</marc:subfield>
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