<i>Einleitung in die Chemische Krystallographie</i> . By P. Groth. Pp. v +80, 6 figures, 8vo, cloth, 4 marks. Leipzig, Wilhelm Engelmann. 1904. English translation by Hugh Marshall, 12mo, cloth, $1.25. New York, John Wiley &amp; Son. 1906; <i>Chemische Krystallographie</i> . By P. Groth. In four volumes. Vol. I., pp. viii +634. 389 figures, 8vo, cloth, 20 marks. Leipzig, Wilhelm Engelmann. 1906.
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