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      <marc:subfield code="a">Coakley, J. P. </marc:subfield>
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      <marc:subfield code="a">CONTOP, a computer program to contour irregularly spaced three-dimensional data, using GPCP / </marc:subfield>
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      <marc:subfield code="a">[Burlington, Ont.] : </marc:subfield>
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      <marc:subfield code="a">"A need exists for graphical data display techniques for use with three-dimensional data sets, in particular, those related to topography (x, y, z) coordinates. The program described here was adapted for such a purpose, but potential applications no doubt can be found in other data sets"--Introduction.</marc:subfield>
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