source
The Brazilian Farmers data were collected as part of a USAID-funded study of farming
practicing in the three countries, India, Nigeria, and Brazil.
There was only one wave of data that contained survey questions regarding
social networks, and only in Brazil did diffusion of the studied farming
innovations reach an appreciable saturation level- that was for hybrid seed
corn. The data were stored along with hundreds of other datasets by the
University of Wisconsin library and I, Tom Valente, paid a fee to have the
disks mailed to me in the early 1990s.