Abstract
THE MINERALOGY OF PENNSYLVANIA. Samuel G. Gordon. Special Publication No. 1, Acad. Nat. Sci. Phila., 1922. Price $3.75.
DAS FEINBAULICHE WESEN DER MATERIE NACH DEM VORBILDE DER KRISTALI. E. Friedrich Rinne. Second and third editions. 8-vo. 168 pages, with 9 plates and 203 figures. Borntraeger Brothers, Berlin, 1922.
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