Avansys Ciudad de Mexico [electronic resource] - [S.l.] : Cums@, [2000] - 1 CD-ROM Subjects--Geographic Terms: MEXICO CITY (MEXICO)--HISTORYMEXICO CITY (MEXICO)--POLITIES AND GOVERNMENTMEXICO CITY (MEXICO)--ECONOMIC CONDITIONSMEXICO CITY (MEXICO)--SOCIAL CONDITIONS LC Class. No.: F1386 / A926C