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Sitios web:<br />
storiadenuestrashuellas.blogspot.com.co/2011/06/clase-7-las-civilizaciones-pristinas.html<br />
https://www.google.com.co/search?q=ciudad+uruk&biw=1366&bih=662&source=lnms&<br />
tbm=isch&sa=X&ved=0ahUKEwiX19_e7bbSAhUH4WMKHdw4CiEQ_AUIBigB#tbm=isch&q<br />
=ciudad+de+egipto+antiguo+social+y+economico&*&imgrc=GZvFp9UoNXs9bM:<br />
http://www.profesorenlinea.cl/cursos/7historia.html