Mineral commodity summaries 2013: Калий

http://pubs.er.usgs.gov/publication/mineral2013

Калий: краткий обзор отрасли

http://minerals.usgs.gov/minerals/pubs/commodity/potash/

Minerals Yearbook 2011

http://minerals.usgs.gov/minerals/pubs/commodity/potash/myb1-2011-potas.pdf

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http://en.wikipedia.org/wiki/Potash
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Potash
http://www.indexmundi.com/en/commodities/minerals/potash/

Marketable Potash: World Production, By Country
http://www.indexmundi.com/en/commodities/minerals/potash/potash_t7.html









http://www.indexmundi.com/commodities/?commodity=potassium-chloride&months=360


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Горная энциклопедия. — М.: Советская энциклопедия. Под редакцией Е. А. Козловского. 1984—1991


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Цены и добыча по 2009 г.



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