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      <marc:subfield code="a">Gullett, D. W., </marc:subfield>
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      <marc:subfield code="a">Historical analysis of population weighted heating degree-days for Canada, 1939-1984 / </marc:subfield>
      <marc:subfield code="c">by D.W. Gullett and D.W. Phillips.</marc:subfield>
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      <marc:subfield code="a">Downsview, Ontario : </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">Issued also in French under the title: Analyse historique de la moyenne des degrés-jours de chauffe pondérée d'après la population canadienne, 1939-1984.</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">"Many attempts have been made over the years to modify the calculation of degree-days in an ongoing effort to find new and improved ways of relating temperature and its effects on man and his activities. One such modification, the weighting of heating degree-days with population statistics to give a more realistic indication of actual heating energy consumption, is the subject of the present work"--Introduction, page 1.</marc:subfield>
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      <marc:subfield code="t">Analyse historique de la moyenne des degrés-jours de chauffe pondérée d'après la population canadienne, 1939-1984 / </marc:subfield>
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