Una dissertaciķ cartogrāfica de 1973 <a href="http://makingmaps.net/2012/03/27/denis-woods-dissertation-i-dont-want-to-but-i-will-pdf/">http://makingmaps.net/2012/03/27/denis-woods-dissertation-i-dont-want-to-but-i-will-pdf/</a><br>
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