The original NCHS file lists Georgia's FIPS State code as 12 which is Florida rather than 13 .
Source File:  nchs2fips_county1990.georgia.fips.13.csv
Source File URL:  http://www.nber.org/data/vital-statistics-mortality-data-multiple-cause-of-death.html
Source Page:  http://www.nber.org/mortality/1991/docs/geocode.txt
nchs2fips_county1990 set up by Jean Roth , jroth@nber.org , 31 Mar 2016