infile dictionary {
    _column(1)       long                             serial   %7f  "Household serial number"
    _column(8)       byte                             pernum   %2f  "IPUMS person number"
   _column(10)       byte                        slaveholder   %1f  "Slaveholder"
   _column(11)       byte                              slave   %1f  "Slave"
   _column(12)        int                           slavenum   %3f  "Slave number within the household"
   _column(15)        int                          slavereel   %3f  "Slave microfilm reel"
   _column(18)        int                          slavepage   %4f  "Slave microfilm page"
   _column(22)       byte                          slaveline   %2f  "Slave microfilm line"
   _column(24)       byte                         slavemicro   %1f  "Slave microfilm sequence"
   _column(25)        int                                age   %3f  "Age"
   _column(28)       byte                                sex   %1f  "Sex"
   _column(29)       byte                              raceg   %1f  "Race -- general"
   _column(30)        int                              raced   %3f  "Race -- detailed"
   _column(33)       byte                               qage   %1f  "Data quality flag for age"
   _column(34)       byte                               qsex   %1f  "Data quality flag for sex"
   _column(35)       byte                              qrace   %1f  "Data quality flag for race"
}