| http://www.w3.org/ns/prov#value | - As a check on the validity of these deductions, consider the curves of U.S. energy and pig-iron production (which he shows in Figures 17 and 18.) Because energy is a common factor in all industrial operation and pig-iron production one of the basic components of heavy industry, the growth in the production of energy and pig iron is a very good indicator of the total industrial production.
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