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      <marc:subfield code="a">Backscatter strength and shaded seafloor relief, Georges Bank, Fundian Channel, and Northeast Channel : </marc:subfield>
      <marc:subfield code="b">sheet 1, Gulf of Maine.</marc:subfield>
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      <marc:subfield code="a">Scale 1:50,000 ; </marc:subfield>
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      <marc:subfield code="c">(W 67°20'--W 66°55'--N 42°42'--N 42°12').</marc:subfield>
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      <marc:subfield code="a">Ottawa, Ontario : </marc:subfield>
      <marc:subfield code="b">Geological Survey of Canada = Commission géologique du Canada, </marc:subfield>
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      <marc:subfield code="c">©2014</marc:subfield>
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      <marc:subfield code="a">Includes text, location map and index map.</marc:subfield>
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      <marc:subfield code="a">"Authors: B.J. Todd, R.C. Courtney."</marc:subfield>
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      <marc:subfield code="a">"This map is part of a nine-map series of Georges Bank, Fundian Channel and Northeast Channel (Todd and Courtney, 2014a, b, c, d, e,f , g, h). The nine maps are the products of a 1999–2000 bathymetric survey that used multibeam sonar systems to map 11,965 km of the seafloor. Other oceanographic expeditions to the area collected geological and biological data for scientific interpretation. This map sheet shows the seafloor topography of Georges Bank in shaded-relief view and backscatter strength (coded by colour) at a scale of 1:50000. Topographic contours generated from the multibeam data are shown (in white) on the colour-coded backscatter strength with an interval of 10m. Bathymetric contours (in blue) outside the multibeam survey are from the Natural Resource Map series (Canadian Hydrographic Service, 1966, 1967, 1971, 1972)"--Introduction.</marc:subfield>
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      <marc:subfield code="a">Todd, Brian J. </marc:subfield>
      <marc:subfield code="q">(Brian Jeremy)</marc:subfield>
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      <marc:subfield code="a">Courtney, R.C., </marc:subfield>
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      <marc:subfield code="u">https://publications.gc.ca/collections/collection_2026/rncan-nrcan/m183-2/M183-2-7251-eng.pdf</marc:subfield>
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