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      <marc:subfield code="a">Aston, D., </marc:subfield>
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      <marc:subfield code="a">Degree days, 1941-1970 : </marc:subfield>
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      <marc:subfield code="c">by D. Aston = Degrès jours, 1941-1970 : Ontario / par D. Aston.</marc:subfield>
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      <marc:subfield code="a">Degrès jours, 1941-1970 : </marc:subfield>
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      <marc:subfield code="b">Fisheries and Environment Canada, Atmospheric Environment = Pêches et l'environnement Canada, Environnement atmosphérique, </marc:subfield>
      <marc:subfield code="c">October 1977.</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">"This Climatic Data Sheet contains monthly and annual values of degree days from approximately 274 stations in Ontario. The stations are arranged in alphabetical order and degree day threshold. Data are listed for stations with an appreciable length of record over the period from 1941 to 1970"--Page [2].</marc:subfield>
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      <marc:subfield code="s">97 KB</marc:subfield>
      <marc:subfield code="u">https://publications.gc.ca/collections/collection_2026/eccc/en58/En58-27-11-77-1.pdf</marc:subfield>
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