TY  - RPRT
TI  - Interfacing U.S. census map files with statistical graphics software: application and use in epidemiology.
AU  - M Rizzardi
AU  - M S Mohr
AU  - D W Merrill
AU  - S Selvin
PY  - 1993
DO  - 10.1002/sim.4780121919
UR  - https://pubmed.ncbi.nlm.nih.gov/8272673/
ID  - 8272673
ER  -