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- [45] CENTRIFUGES - POTASH INDUSTRY ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1979, (SEP): : 15 - 15
- [49] Situation of the potash industry Glueckauf: Die Fachzeitschrift fur Rohstoff, Bergbau und Energie, 1998, 134 (09): : 495 - 500
- [50] The Alsatian potash industry JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY-US, 1921, 13 : 227 - 227