Inventive activity and the market for technology in the United States, 1840-1920
Inventive activity and the market for technology in the United States, 1840-1920 - Cambridge, Mass. : National Bureau of Economic Research, 1999 - 38
TECHNOLOGICAL INNOVATIONS--ECONOMIC ASPECTS--UNITED STATES--HISTORY--19TH CENTURY
INVENTIONS--ECONOMIC ASPECTS--UNITED STATES--HISTORY--19TH CENTURY
PATENTS--LAW AND LEGISLATION--ECONOMIC ASPECTS--UNITED STATES--HISTORY--19TH CENTURY
HC79 .T4 / L352I