http://AATesaurus.cultura.gencat.cat/aat/getty_enhttp://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31473236sanitary sewers http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31473236 sewers by function BT http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31473236 sanitary drainage systems RT http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31473236 sanitary sewer UF http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31473236 sewers, sanitary UF