% Michigan.dbf file contains 1990 census information on:
% zip code areas:
% col 1 =  AREAKEY
% col 2 = LATITUDE
% col 3 = LONGITUDE
% col 4 = 1990POP
% col 5 = 1990EMPLOY
% col 6 = MEDINCOME (median household income)
% col 7 = PCINCOME  (per capita income)
% col 8 = percent living in POVERTY
% col 9 = # of HOUSES
% col10 = MEDRENT
% col11 = WHITEPOP
% col12 = BLACKPOP
% col13 = NATIVEPOP
