THE LABORATORY INVESTIGATION OF ORES. A SYMPOSIUM. ERNEST E. FAIRBANKS AND oTHERS. 262+ix pages. McGraw_Hill Book Co.New york. 1928. Price $3.50.

LEHRBUCH DER KRISTALLPHYSIK (mit Ausschluss der Kristalloptik) Woldemar Voigt. 213 figures in the text and a Table, pages XXXVI+978, 15X22.5 cm., reprinted from the first edition of 1910 by B. G. Teubner, Leipzig and Berlin, 1928. Price 41 R. M.

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