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The Rare Earths

Note 11 — Chapter I · THE NATURE OF THE MINERALS AND THEIR MODE OF OCCURRENCE

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See Brögger, Die Mineralien der Süd-Norwegische Granit-Pegmatitgänge, Christiania, 1906.

[12] Bull. Imp. Inst., 1911, vol. ix; No. 2, p. 103.

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