"U.S. Census Grids." Socioeconomic Data applications center. 25 Jul 2007
http://sedac.ciesin.columbia.edu/usgrid/>. A great web site that provides U. S maps with various socioeconomic
data. Great for use with the second lesson in this unit.
Johnson, Margaret. "A study of Medieval World Maps." 08 Jul 2007 http://Valpo.edu/geocities/geo/courses >.
"Norman B. Leventhal Map Center." Boston Public Library. 9 Jul 2007 http://maps.bpl.org>.
David Rumsey Map Collection. 9 Jul 2007 http://www.davidrumsey.com>.
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