Columbia subject headings:
Diffusion of innovations--United States.
Policy sciences.
United States--Politics and government--1945-1989.
Harvard subject headings:
Diffusion of innovations--United States.
Policy sciences.
United States--Politics and government--1945-1989.
Princeton subject headings:
Diffusion of innovations--United States.
Policy sciences.
United States--Politics and government--1945-1989.