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First 1:50000 Topographic Map from the Spanish National Mapping Agency (IGN) WMS service with the current city districts boundaries.
Districts of Madrid provided by the city Open Data portal at http://datos.madrid.es/portal/site/egob/menuitem.c05c1f754a33a9fbe4b2e4b284f1a5a0/?vgnextoid=46b55cde99be2410VgnVCM1000000b205a0aRCRD&vgnex