Abstract

The Coal Division of the Illinois State Geological Survey employs the Hollerith punched-card system for recording and tabulating data used in the preparation of structural contour maps based on the altitude of key coal beds. By the use of the punched-card method, after data are once recorded accurately, no further checking is necessary, no matter how they may be reorganized or summarized. A similar system is also being used for recording and tabulating the great variety of information on the chemical characteristics of Illinois coals and coal ashes.

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