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      <marc:subfield code="a">Burrows, William Russell,</marc:subfield>
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      <marc:subfield code="a">Differences in temperature data from ordinary climatological stations arising from once daily readings as compared to twice daily readings / </marc:subfield>
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      <marc:subfield code="a">Digitized edition from print [produced by Environment and Climate Change Canada].</marc:subfield>
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      <marc:subfield code="a">"Circular 3963."</marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references (page 8).</marc:subfield>
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      <marc:subfield code="a">"For guidance in comparing temperature data from stations reading extremes of temperature only once daily with that from stations reading twice each day, estimated differences arising from the two different procedures have been calculated for ten stations across Canada"--Abstract.</marc:subfield>
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