Hallbouty, Michael T. Salt Domes. Gulf Region, U.S. & Mexico. Houston, 1962
Priny the Elder. Natural History. New York, 1958
Tannahill, Reay. Food in History. New York, 1973
Kurlansky, Mark. Salt:A World History. New York, Penguin Books, 2002
Tocci, Salvatore. Sodium. Children's Press, 2005
Borghausen History. Salt Trade. 20 May 2000.   http://home.comeast.net/~ludwig5o/salttrade.html
Saharan trade, Link Between Europe & Africa. 18 January 2007.   http://library.thinkquest.org/13406/sh/?tqskip1=1&tqtime=0906
Salt Monopolies 1 - India 19 January 2002.   http://salt.org.il/india.html
Erltic Artisan Sea Salt by Le Palvdier 20 January 2007.   http://eco-natural.com/greysalt/salt.html
Stealth Salt. 14 February 2007.   http://health.msn.com/dietfitness/articlepage.aspx?cp-documentid=100155296>1=9033
Characteristics and Classifications of Salt. 12 January 2007.  http://www.factmonster.com/ceb/sci/A0860900.html
History of Salt. 12 January 2007.   http://www.saltinstitute.org/38.html
History of Salt. 12 January 2007.   http://www.saltworks.us/salt_info/si_/HistoryofSalt.asp
History of Salt. 20 November 2006.   http://en.wikipedia.org/wiki/History_of_Salt
Salt tax Silver. 12 January 2007.   http://www.geocities.com/athens/2707/econ.html
Mixtures and Compounds. 27 January 2007.   http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/M/Mixures.html
Salt. Chemical Compound. 27 January 2007.   http://www.bartleby.com/b5/sa/salt.html
Salt. 27 January 2007.   http://www.encyclopedia.com/doc/IEI-Salt.html
The ghostly salt city beneath Detroit. 7 April 2007   http://info.detnews.com/history/story/index.cfm?id=17&category=business