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<br /> <br />legend <br />o San Marcos - Hydrography <br /> <br />'* Capital <br />. Major City <br /> <br />State <br />Boundary <br />~J Mexico <br /> <br />1 inch e uals 60 miles <br /> <br /> <br />.. City of San Marcos <br />. Department of Environment <br />and Engineering February 2005 <br />