ECONOMIC GEOLOGY
Mineral Deposits. 4th Edition, by W. Lindgren, 1933, McGraw-Hill Book Co. The manner of occurrence and origin of mineral deposits.
Elements of Engineering Geology. 2nd Edition, by H. Ries and T. L. Watson, 1947, John Wiley and Sons.
This Fascinating Oil Business. By M. W. Ball, 1940, Bobbs-Merrill Co. A simple and elementary description of the petroleum industry.
Geology of Coal. By O. Stutzer and A. C. Noe, 1940, University of Chicago Press.