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    <marc:controlfield tag="008">190618s1973    oncao  #o    f000 0 eng d</marc:controlfield>
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      <marc:subfield code="b">eng</marc:subfield>
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      <marc:subfield code="a">n-cn---</marc:subfield>
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      <marc:subfield code="a">Id36-6/1973E-PDF</marc:subfield>
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    <marc:datafield tag="245" ind1="0" ind2="0">
      <marc:subfield code="a">Automation in air traffic control : </marc:subfield>
      <marc:subfield code="b">the Canadian approach : a report on one of the world's most advanced air traffic control systems.</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="246" ind1="1" ind2="0">
      <marc:subfield code="a">Report on one of the world's most advanced air traffic control systems</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="264" ind1=" " ind2="1">
      <marc:subfield code="a">Ottawa, Ontario, Canada : </marc:subfield>
      <marc:subfield code="b">Department of Industry, Trade and Commerce, Electrical and Electronics Branch, </marc:subfield>
      <marc:subfield code="c">1973.</marc:subfield>
    </marc:datafield>
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      <marc:subfield code="a">1 online resource (15 pages) : </marc:subfield>
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      <marc:subfield code="a">computer</marc:subfield>
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      <marc:subfield code="a">Digitized edition from print [produced by Innovation, Science and Economic Development Canada].</marc:subfield>
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    <marc:datafield tag="520" ind1=" " ind2=" ">
      <marc:subfield code="a">"The volume of air traffic in Canada and around the world has been rising steadily during the past decade and all indications are that it will continue to increase, possibly accelerate, through the 70s and 80s. Air traffic requires precision control, and the demand on the control system in high traffic density areas has already reached a level at which improved techniques and equipment are essential if safety standards and efficiency are to be maintained"--Introduction, page 2.</marc:subfield>
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      <marc:subfield code="2">gccst</marc:subfield>
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      <marc:subfield code="2">gccst</marc:subfield>
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      <marc:subfield code="a">Canada. </marc:subfield>
      <marc:subfield code="b">Department of Industry, Trade and Commerce.</marc:subfield>
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      <marc:subfield code="q">PDF</marc:subfield>
      <marc:subfield code="s">7.32 MB</marc:subfield>
      <marc:subfield code="u">https://publications.gc.ca/collections/collection_2019/isde-ised/id36/Id36-6-1973-eng.pdf</marc:subfield>
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