Blar i NGU Open Archive på forfatter "Johnson, Erling"
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Om tilgodegjørelse av kalifeltspatens kaliinhold.
Johnson, Erling (NGU (109), Journal article, 1922)(forkortet) A review is given of the possibilities of Norway providing her re- quirements of potash by utilizing the raw materials witch are to be found within her boundaries, especially the feldspars. Hitherto Norway has ...