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http://go-passport.grolier.com/main?page=passport Search: “Indus Civilization” Search: “Ancient Egypt” Search: “Ancient China” Search: “Ancient Mesopotamia” EGYPT: http://www.ancientegypt.co.uk/menu.html http://www.rivervalleycivilizations.com/nile.php http://www.ancient-egypt.org/ http://www.bbc.co.uk/history/ancient/egyptians/ http://en.wikipedia.org/wiki/Ancient_Egypt MESOPOTAMIA: http://www.rivervalleycivilizations.com/tigris-euphrates.php http://mesopotamia.mrdonn.org/ http://www.mesopotamia.co.uk/ http://www.kidskonnect.com/subject-index/16-history/257-ancient-mesopotamia.html INDUS: http://www.rivervalleycivilizations.com/indus.php http://india.mrdonn.org/indus.html http://en.wikipedia.org/wiki/Indus_Valley_Civilization http://www.ancientindia.co.uk/indus/home_set.html http://www.csuchico.edu/~cheinz/syllabi/asst001/fall97/2chd.htm http://www.boloji.com/architecture/00002.htm YELLOW RIVER (HUANG HE): http://www.rivervalleycivilizations.com/yellow.php http://www.travelchinaguide.com/river/yellow/civilization.htm http://www.cis.umassd.edu/~gleung/