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Columbis, Ohio, Ohio State University, Department of Geography, (1977). (Studies in the Diffusion of Innovation Discussion Paper No. 37) 24 pThe supply side of family planning spread in the U.S. is studied by examination of the diffusion of Planned Parenthood affiliates in this country. This diffusion is an example of nonprofit-motivated polynuclear diffusion with central propagator support. Such diffusion was key to increasing availability of and information regarding family planning services. The temporal pattern of the diffusion followed the process outlined: high growth from 1916-1939, very slow growth from 1940-1960, and high growth from 1961-1973. This process was initiated in response to birth rate changes and other social events, governmental initiative, and organizational changes within the central propagator. The diffusion spread from the largest cities to surrounding communities, and from north and east to west and south. The number of women in the 15-44 age group and the number of these women ever-married were 2 specific variables of importance in the spread; median family income and median school years completed for the 3rd organizational period were variables of importance in the organizing capacity of the diffusion.