Firearm prevalence and social capital
The following citation is from the ICPSR Bibliography of Data-related Literature:
Hemenway, David, Kennedy, Bruce P., Kawachi, Ichiro, Putnam, Robert D. Oct 2001. Firearm prevalence and social capital. Annals of Epidemiology. 11, (7), 484-490. doi:10.1016/S1047-2797(01)00235-6
The citation above relates to an ICPSR study that is forthcoming.