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      <marc:subfield code="a">Ford, J. S., </marc:subfield>
      <marc:subfield code="e">author.</marc:subfield>
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      <marc:subfield code="a">An engineering proposal for a sonde to measure ice jam thickness / </marc:subfield>
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      <marc:subfield code="a">[Burlington, Ont.] : </marc:subfield>
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      <marc:subfield code="c">March 1984.</marc:subfield>
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      <marc:subfield code="a">Technical note ; </marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references.</marc:subfield>
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      <marc:subfield code="a">"Ice jams in the spring breakup period are economically important because of their potential to do damage through flooding of private and public property. Recent studies have worked toward understanding the mechanics and formations of ice jams that are in equilibrium (Beltaos, 1983, Shen et al., 1982)"--Introd.</marc:subfield>
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      <marc:subfield code="a">Technical note (National Water Research Institute (Canada). Hydraulics Division)</marc:subfield>
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