https://en.wikipedia.org/wiki/Salt
http://www.amazon.com/Salt-World-History-Mark-Kurlansky/dp/0142001619
Podcasts
http://www.bbc.co.uk/programmes/p02wknj3#auto
http://www.bbc.co.uk/programmes/p02x3vv8
Africa
http://www.nytimes.com/2001/02/13/world/in-sahara-salt-mine-life-s-not-too-grim.html
Australia
http://www.nzherald.co.nz/world/news/article.cfm?c_id=2&objectid=11124001
Worldwide
http://www.notesontheroad.com/Ying-s-Links/Beautiful-Salt-Mines-Around-the-World.html
Of Interest
http://chronicle.com/blogs/profhacker/the-salt-mines-really/22927
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