Subjects: PROGRESS; ECONOMIC development; TECHNOLOGICAL progress
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Subjects: ROMER, Paul M., 1955-; ECONOMISTS; TECHNOLOGICAL innovations & economicsUNITED StatesUNITED StatesUNITED StatesReport Available
Subjects: TECHNOLOGICAL innovations; WORLD War II; OBAMA, Barack, 1961-UNITED StatesUNITED StatesUNITED StatesReport Available