Extension of the Federal District by the decree of August 3, 1862 by President Benito Juárez, based on descriptions and http://mapserver.inegi.gob.mx/geografia/espanol/estados/edomex/imgs15/datoshis.pdf and Javier Romero Quiroz book, Territorial division and heraldry of the state of Mexico of 1977, published in Mexico by the state government of Mexico, no ISBN, pages 72 to 73.
Own work
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