The Rate and Direction of Inventive Activity: Economic and Social Factors.

National Bureau of Economic Research Volume Title: The Rate and Direction of Inventive Activity: Economic and Social Factors Volume Author/Editor: Universities-National Bureau Committee for Economic Research, and Committee on Economic Growth of the Social Science Research Council Volume Publisher: Princeton University Press Volume ISBN: 0-87014-304-2 Volume URL: http://www.nber.org/books/univ62-1 Conference Date: Publication Date: 1962