Full text: The Elements of economic geology 

THE ELEMENTS OF 
ECONOMIC GEOLOGY 
J. W. GREGORY 
D.Sc, F.R.S.,, M.LM.M. 
PROFESSOR OF GEOLOGY IN THE UNIVERSITY OF GLASGOW 
WITH SIXTY-THREE DIAGRAMS 
METHUEN & CO. LTD. 
36 ESSEX STREET W.C. 
LONDON
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