State seal of Mexico according to Decree No. 39'published in the Official Gazette of the State of Mexico,the April 16, 1941. In use between 1941 and 1977. Based on the book shown on Javier Romero Quiroz, territorial division and heraldry of the state of Mexico, published in 1977, in Mexico, for the government of Estado de Mexico. And file http://es.wikipedia.org/wiki/Archivo:Escudo_del_Estado_de_México.png
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Sarumo74