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Joseph R. Heckman (17 January 2002). "Potash Terminology and Facts"(PDF). Plant & Pest Advisory. 7 (13). Rutgers University: 3. Archived from the original(PDF) on 19 July 2011. Retrieved 29 January 2011. Reprinted from Agri-Briefs, of the Agronomists of the Potash & Phosphate Institute, Winter 2001–2002, No.7