Gary King. 1997. A Solution to the Ecological Inference Problem: Reconstructing Individual Behavior from Aggregate Data. Princeton: Princeton University Press. Copy at https://tinyurl.com/y3snlo7n
This book won the Gosnell Prize for the best methodological work in political science in the preceeding year, and was listed as one of the Breakthrough Books in Geography; the accompanying sofware won the APSA Research Software Award).