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Bbc - science & nature - human body mind - interactive, An exploration human body functions. http://www.bbc.co.uk/science/humanbody/body/index_interactivebody.shtml Http://sciencenetlinks./interactives/systems.html, . http://sciencenetlinks.com/interactives/systems.html Gray, henry. 1918. anatomy human body - bartleby., Gray' anatomy human body features 1,247 vibrant engravings. http://www.bartleby.com/107/