This polygon shapefile represents shows contour lines of Mexico at 90 meter intervals. These data are intended for geographic display and analysis at the city level. No responsibility is assumed by the Instituto Nacional de Estadistica y Geografia or LeadDog Consulting. Instituto Nacional de Estadística, Geografía e Informática (Mexico) and LeadDog Consulting. (2010). 90-Meter Contour Lines: Mexico, 2010. LeadDog Consulting Available at: http://purl.stanford.edu/xj598qw2877