by Arthur John George Notholt
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Fluorspar
Gypsum and anhydrite
Phosphate rock
Salt
Sulphur
Phosphorite research and development
Potash deposits in the Gibson Dome area,...
Uslovii͡a obrazovanii͡a mestorozhdeniĭ k...
Potash in the greensands of New Jersey
Potash availability--market economy coun...
World survey of potash resources
Potash deposits of salt mine, Khewra, Jh...