WORKS CITED

http://teachinghistory.org/history-content/beyond-the-textbook/23923

http://www.kerryr.net/images/pioneers/gallery/analytical_engine_lg.jp

http://ic.galegroup.com/ic/whic/home

http://i00.i.aliimg.com/photo/v0/112973132/Steam_Coal.jpg

http://waiclean.com/wp-content/uploads/2013/09/1681409-poster-1280-water-vapor-body.jpg