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If you would like to link to one of the pdf files for the page you were on (Differential Equations / Partial Differential Equations / Laplace's Equation) the URL's for each of the pdf files that are available are below.Book URL's
Notes : http://tutorial.math.lamar.edu/GetFile.aspx?file=B,1,N
Notes : http://tutorial.math.lamar.edu/GetFile.aspx?file=C,78,N
Notes : http://tutorial.math.lamar.edu/GetFile.aspx?file=S,477,N
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