Columbia subject headings:
Diffusion of innovations.
Economic development.
Technological innovations--United States.
Harvard subject headings:
Diffusion of innovations.
Economic development.
Technological innovations--United States
United States--Economic conditions.
Princeton subject headings:
Diffusion of innovations--United States.
Diffusion of innovations.
Economic development.
Technological innovations--Economic aspects--United States.
Technological innovations--Economic aspects.
United States--Economic conditions.